Manipulating E-Cigarette Nicotine to Promote Public Health
Not Applicable
Recruiting
- Conditions
- Tobacco-Related Carcinoma
- Interventions
- Procedure: Biospecimen CollectionProcedure: Carbon Monoxide MeasurementOther: Vaping sessionOther: Survey Administration
- Registration Number
- NCT06448351
- Brief Summary
This clinical trial explores the manipulation of e-cigarette (EC) nicotine to promote public health. Researchers are trying to understand and gather information about how the strength, form, and structure of nicotine in products play a significant role in their potential for addiction and how they might affect health risks. The information gained from this study may allow researchers to understand how these aspects of nicotine influence the potential for addiction, how people puff on ECs, how the body processes nicotine, and any potential harmful effects it might have on health. Exploring these specific characteristics of nicotine may also determine if an EC product standard could help identify optimal nicotine levels for users.
- Detailed Description
PRIMARY OBJECTIVES:
I. Assess the pharmacological, metabolic, and behavioral impact of nicotine dimensions. (Study 1) II. Assess the toxicity resulting from different nicotine dimension combinations. (Study 1) III. Across ecologically valid nicotine concentrations and isomer ratios, determine free-base (FB) nicotine fractions with minimal appeal to young adult EC users but sufficient appeal to smokers. (Study 2)
OUTLINE:
Phase 1 (STUDY 1): Participants are randomized to the order of 8 e-liquid combinations varying in nicotine concentration, form, and isomer.
Participants participate in a 10-puff vaping session over 5 minutes with a study e-liquid using the study EC device followed by a 60 minute washout period and then an ad libitum puffing session over 60 minutes at each lab visit. Patients are also given a new pre-filled study device corresponding to the study e-liquid they will use for the subsequent visit to practice at home. Puffing sessions continue with a new study e-liquid at each of the 8 lab visits lasting up to 4 hours each. Participants also undergo carbon monoxide (CO) testing and blood and urine sample collection on study.
Phase 2 (STUDY 2): Participants are randomized to the order of 20 e-liquid combinations varying in concentration, FB fractions, and isomer.
Participants will take part in a 2-puff vaping session with each of the 20 study e-liquids using the study EC device with a 10-minute washout period between each vaping session. Vaping sessions are grouped into two blocks of 10 separated by a 30 minute resting session over one lab visit lasting up to 6 hours. Participants also undergo CO testing and blood and urine sample collection on study.
Recruitment & Eligibility
- Status
- RECRUITING
- Sex
- All
- Target Recruitment
- 350
Inclusion Criteria
- Current exclusive young adult EC user for at least the past 3 months (confirmed by cotinine testing strip) between 21-24 years old with no/minimal history of smoking cigarettes (< 10 cigarettes in entire life)
- Current older adult smoker (daily use, ≥ 100 cigarettes in entire life) aged 25-65 with interest in trying an EC
- Willing to abstain from all nicotine, tobacco products, and marijuana for at least 12 hours before study visits
- Read and speak English
Exclusion Criteria
- Currently attempting to quit nicotine or tobacco products
- Currently pregnant (will be verified with urine pregnancy test), planning to become pregnant, or breastfeeding
- Current daily use of other tobacco products other than ECs or cigarettes (use of > 10 traditional cigars, cigarillos, or filtered cigars in entire life; use of smokeless tobacco products > 10 times in entire life; or hookah in the last 30 days)
- Self-reported diagnosis of lung disease including asthma, cystic fibrosis, or chronic obstructive pulmonary disease
- New or unstable cardiovascular disease diagnosed within the past 3 months
- Use of medications that are inducers of CYP2A6 enzyme such as rifampicin, dexamethasone, phenobarbital, and other anti-convulsion drugs
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- FACTORIAL
- Arm && Interventions
Group Intervention Description Phase 1, Arm 1 (High, Nic, S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 2 (High, Nic, R/S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 2 (High, Nic, R/S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 1 (High, Nic, S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 4 (Low, Nic, R/S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 5 (High, NicH+, S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 5 (High, NicH+, S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 6 (High, NicH+, R/S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 1 (High, Nic, S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 2 (High, Nic, R/S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 4 (Low, Nic, R/S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 7 (Low, NicH+, S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 2, Arm 1 (High, 5%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 1 (High, 5%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 3 (Low, 5%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 3 (Low, 5%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 4 (Low, 5%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 1 (High, 5%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 1, Arm 2 (High, Nic, R/S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 3 (Low, Nic, S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 6 (High, NicH+, R/S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 1 (High, Nic, S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 3 (Low, Nic, S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 4 (Low, Nic, R/S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 5 (High, NicH+, S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 7 (Low, NicH+, S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 8 (Low, NicH+, R/S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 8 (Low, NicH+, R/S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 8 (Low, NicH+, R/S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 3 (Low, Nic, S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 3 (Low, Nic, S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 4 (Low, Nic, R/S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 5 (High, NicH+, S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 6 (High, NicH+, R/S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 6 (High, NicH+, R/S) Carbon Monoxide Measurement Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 7 (Low, NicH+, S) Survey Administration Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 1, Arm 8 (Low, NicH+, R/S) Biospecimen Collection Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 2, Arm 1 (High, 5%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 1, Arm 7 (Low, NicH+, S) Vaping session Participants are randomized to vape one out of the eight study e-liquids in a 10-puff vaping session over 5 minutes using the e-cig study device and then in an ad libitum puffing session over 60 minutes. The 8 e-liquids vary in nicotine concentration (low \[20 mg/g\] or high \[50 mg/g\]), form (Nic or NicH+), and isomer (S-nicotine or R/S nicotine). Phase 2, Arm 4 (Low, 5%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 5 (High, 25%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 5 (High, 25%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 11 (Low, 45%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 11 (Low, 45%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 2 (High, 5%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 2 (High, 5%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 2 (High, 5%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 3 (Low, 5%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 8 (Low, 25%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 9 (High, 45%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 9 (High, 45%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 2 (High, 5%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 3 (Low, 5%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 4 (Low, 5%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 6 (High, 25%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 6 (High, 25%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 7 (Low, 25%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 8 (Low, 25%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 14 (High , 65%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 4 (Low, 5%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 5 (High, 25%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 5 (High, 25%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 6 (High, 25%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 7 (Low, 25%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 7 (Low, 25%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 8 (Low, 25%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 8 (Low, 25%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 9 (High, 45%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 10 (High, 45%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 6 (High, 25%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 7 (Low, 25%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 10 (High, 45%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 10 (High, 45%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 12 (Low, 45%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 13 (High , 65%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 9 (High, 45%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 10 (High, 45%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 12 (Low, 45%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 13 (High , 65%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 14 (High , 65%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 14 (High , 65%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 15 (Low, 65%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 11 (Low, 45%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 11 (Low, 45%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 13 (High , 65%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 16 (Low, 65%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 16 (Low, 65%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 17 (High, 85%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 20 (Low, 85%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 20 (Low, 85%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 12 (Low, 45%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 12 (Low, 45%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 13 (High , 65%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 15 (Low, 65%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 16 (Low, 65%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 17 (High, 85%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 18 (High, 85%, R/S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 18 (High, 85%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 14 (High , 65%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 18 (High, 85%, R/S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 15 (Low, 65%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 17 (High, 85%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 19 (Low, 85%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 19 (Low, 85%, S) Vaping session Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 19 (Low, 85%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 20 (Low, 85%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 15 (Low, 65%, S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 18 (High, 85%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 19 (Low, 85%, S) Biospecimen Collection Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 20 (Low, 85%, R/S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 16 (Low, 65%, R/S) Survey Administration Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours. Phase 2, Arm 17 (High, 85%, S) Carbon Monoxide Measurement Participants vape 20 different study e-liquids varying in concentration (low \[20 mg/g\] or high \[50 mg/g\]), freebase nicotine percentage (5%, 25%, 45%, 65%, or 85%), and isomer (S-nicotine or R/S nicotine) using the e-cig study device during a single visit lasting up to 6 hours.
- Primary Outcome Measures
Name Time Method Nicotine toxicity measures (Study 1) Up to 2 years Will be assessed by carbonyl yields reported as ug/session or ug/puff or normalized per nicotine yield for a head-to-head comparison between different nicotine conditions.
In vitro nicotine toxicity measures: Cell cycle and proliferation (Study 1) Up to 2 years Will be assessed by cell cycle and proliferationg.
In vitro nicotine toxicity measures: Cytotoxicity (Study 1) Up to 2 years Will be assessed by cytotoxicity, senescence.
In vitro nicotine toxicity measures: Senescence (Study 1) Up to 2 years Will be assessed by senescence.
Nicotine yield (Study 1) Up to 2 years Using a dilute-and-shoot method developed by our team, nicotine yield in EC aerosol will be quantified using the "playback" technique (i.e., use topography collected from participants to machine-generate EC aerosols) and GC-MS method, developed by our group to minimize the PG/VG interference not addressed by other methods.
Nicotine pharmacokinetics: Maximum nicotine blood level (Cmax) (Study 1) Immediately before puffing (-5 minutes), and at 5, 15, 60, and 120 minutes after the start of the puffing session Blood nicotine samples will be assayed using liquid chromatography tandem mass spectrometry (LC-MS/MS) with deuterated internal standards.
Nicotine pharmacokinetics: Time to maximum blood level (Tmax) (Study 1) Immediately before puffing (-5 minutes), and at 5, 15, 60, and 120 minutes after the start of the puffing session Blood nicotine samples will be assayed using LC-MS/MS with deuterated internal standards.
Nicotine pharmacokinetics: Area under the curve (AUC) (Study 1) Immediately before puffing (-5 minutes), and at 5, 15, 60, and 120 minutes after the start of the puffing session Blood nicotine samples will be assayed using LC-MS/MS with deuterated internal standards.
Reactive oxygen species (ROS) (Study 1) Up to 2 years The recorded puffing topographies will be sent to the analytical lab for "puff playback" generation of EC aerosols and quantification of ROS. We will use an acellular ROS assay previously developed by our team as a generic toxicity assessment method.
Nicotine metabolism (Study 1) At 60 minutes after the start of each puffing session The rate of nicotine metabolism will be assessed using the standard method of nicotine metabolite ration (NMR) = hydroxycotinine/cotinine, modified to reflect stereoselective metabolism. Plasma concentration of cotinine, and hydroxycotinine will be measured by chiral LC-MS/MS based on previous methods and quantified using the ratio of metabolites to internal standards.
Modified Cigarette Evaluation Questionnaire (mCEQ)(Study 1) Study visits 2 through 9 The modified Cigarette Evaluation Questionnaire (mCEQ) will assess subjective responses. The 11-item mCEQ includes five subscales: Smoking Satisfaction, Psychological Reward, Aversion, Enjoyment of Respiratory Tract Sensations, and Craving Reduction, with items rated from 1 (not at all) to 7 (extremely likely). Items are averaged to create each of the subscales also ranging from 1 to 7 with higher values indicating greater levels of smoking satisfaction, psychological reward, aversion, enjoyment of respiratory tract sensations, and craving reduction.
Minnesota Nicotine Withdrawal Scale (MNWS)(Study 1) Study visits 2 through 9 Asses Nicotine withdrawal and smoking craving, anger/irritability, anxiety, depressed mood, restlessness/difficulty concentrating, increased appetite, sleep problems, and somatic symptoms (nausea, constipation, sore throat, dizziness, coughing). Scores range from 0 to 4 with higher scores indicating greater levels of withdrawal (MNWS) or more craving to smoke (MNWS Craving).
Puffing topography: Puff count (Study1) 60 minute puffing session at each of the 8 study lab visits Puff count will be measured.
In vitro nicotine toxicity measures: RNA sequencing (Study 1) Up to 2 years Will be assessed by RNA sequencing.
Tiffany-Drobes Questionnaire of Smoking Urges: Brief Form (QSU) Study visits 2 through 9 Smoking and vaping urges/craving will be measured using the Tiffany-Drobes Questionnaire of Smoking Urges: Brief Form with a modified version (replacing the word "cigarette" with "e-cigarette") for EC users. This is a 10-item measure where participants rate smoking/vaping-related items on a 7-point Likert scale ranging from 1 (strongly disagree) to 7 (strongly agree). Similar to previous studies, we will collapse the items into two previously identified factors (Factor 1: strong desire and intention to smoke/vape; Factor 2: anticipation of relief from withdrawal symptoms). Scores are calculated by summing the items and range from 5 to 35 for each of the factors with higher scores indicating greater craving to smoke/vape.
Drug Effects/Liking Questionnaire (DEQ)(Study 1) Study visits 2 through 9 Assess the desire and liking of products, positive and negative effects (i.e., side effects), and perceived strength and effectiveness. Scores range from 1 to 5 with higher scores indicating greater strength (effect from smoking cigarettes/vaping e-cigarettes) or liking (liking of effect from smoking cigarettes/vaping e-cigarettes)
Puffing topography: Flow rate (Study1) 60 minute puffing session at each of the 8 study lab visits Flow rate will be measured.
Puffing topography: Average puff duration (Study1) 60 minute puffing session at each of the 8 study lab visits Average puff duration will be measured.
General Labeled Magnitude Scale (gLMS) (Study 2) 1 six hour lab visit Complete the General Labeled Magnitude Scale (gLMS) after each condition. Scores range from 0 "No Sensation" to 100 "Strongest Imaginable".
Labeled Hedonic Scale (LHS) (Study 2) 1 six hour lab visit Complete the Labeled Hedonic Scale (LHS) after each condition. Scores range from -100 "Most Disliked Imaginable" to 100 "Most Liked Imaginable".
Puffing topography: Volume (Study1) 60 minute puffing session at each of the 8 study lab visits Puff volume will be measured.
Sensory Attributes (Study 2) 1 six hour lab visit Rate sensory attributes (smoothness, harshness, sweetness, bitterness) on a 100-unit visual analog scale after each condition.
Overall acceptance: Industry-designed Thermometer Rating Scale (Study 2) 1 six hour lab visit Complete a tobacco industry-designed thermometer rating scale of overall acceptance after each condition. Ratings range from 0 "the very worst" to 100 "the very best", with 50 indicating "indifferent".
Puffing topography: inter-puff interval (Study1) 60 minute puffing session at each of the 8 study lab visits Inter-puff interval will be measured.
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (1)
Ohio State University Comprehensive Cancer Center
🇺🇸Columbus, Ohio, United States