Nicotine Withdrawal and Reward Processing

Not Applicable

Completed

• Conditions: Cigarette Smoking; Nicotine Dependence; Nicotine Withdrawal
• Interventions: Other: Smoking Abstinence; Other: Ad Lib Smoking

• Registration Number: NCT05041959
• Lead Sponsor: University of Oklahoma

Brief Summary

This study is designed to find out how smoking affects the way the brain responds to pleasure and how this impacts smokers' behavior. Participants will complete three sessions. The first session will be a screening and training visit to determine final eligibility. Eligible participants will work with a researcher to develop brief scripts about times when they smoke and do other activities. Next, participants will attend two magnetic resonance imaging (MRI) scans - one after abstaining from smoking for 24 hours and the other after smoking as usual. After the second MRI, participants will answer questions on their phone every day for two weeks.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2021-09-03
• Study First Submitted QC: 2021-09-03
• Study First Posted: 2021-09-13
• Study Start: 2022-06-02
• Primary Completion: 2024-03-29
• Study Completion: 2024-04-15
• Status Verified: 2024-05
• Last Update Submitted: 2024-05-06
• Last Update Posted: 2024-05-08

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 58

Inclusion Criteria

1. Generally healthy
2. Age 21-55
3. Right-handed using a three-item scale
4. Daily smoker of ≥ 6 cigarettes/day
5. Smoking regularly for ≥ 1 year
6. Have a smartphone capable of running the MetricWire application
7. Able to read and understand English
8. Able to identify at least 6 pleasurable activities they do not do concurrently with smoking or associate with smoking.
9. Able to identify at least 6 unique locations/scenarios they do associate with smoking

Exclusion Criteria

1. Planning to quit smoking within the next 60 days

2. Currently seeking or receiving treatment for smoking cessation

3. Use of smokeless tobacco, nicotine replacement products or electronic cigarettes more than 5 days in the past month.

4. Breath alcohol level ≥.001. Participants may be allowed one reschedule at the discretion of the PI or other study staff.

5. Positive toxicology screen for illicit drugs

   1. Marijuana will be tested for but will not be exclusionary
   2. Participants failing the toxicology screen may be allowed one re-screening attempt at the PI's discretion
   3. Participants with valid prescriptions who report using the medication as directed and meet all other eligibility criteria may be allowed to participate at the PI's discretion

6. Current use of antipsychotic or stimulant medications.

7. Significant health problems or those that would impact scientific goals of the project, including (but not limited to):

   1. Cancer, Bronchitis, Emphysema, COPD
   2. Asthma or Breathing Problems
   3. Insulin-Dependent Diabetes
   4. Heart disease, angina, heart failure, serious arrhythmia or heart attack within the past 6 months
   5. Systolic Blood Pressure > 160, Diastolic Blood Pressure > 100, HR > 115 bpm (one re-screen allowed).
   6. Glaucoma, color blindness or an uncorrected vision problem
   7. Significant hearing loss requiring the use of hearing aids or other hearing problems that would impact
   8. History of stroke, brain tumor, seizure disorder, or traumatic brain injury
   9. Metal implants (e.g. pacemaker, surgical pins, certain dental repairs), dental braces, or metal fragment injuries.
   10. Claustrophobia
   11. Weight > 350 pounds or unable to fit in the MRI scanner bore
   12. Current psychotic disorder, alcohol use disorder or drug use disorder for drugs other than cannabis (moderate or severe only, mild is allowable at PI's discretion). AUD and DUD in remission are also allowable at PI's discretion.
   13. Pregnant, breastfeeding or planning to become pregnant during the course of the study (females)

8. Current enrollment in another smoking research study or having participated in a study involving daily use of Spectrum cigarettes or other reduced nicotine products within the past three months

9. Irregular sleep-wake cycles (e.g. swing-shift work, unusual sleep pattern)

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Smoking Abstinence	Smoking Abstinence	Participants will abstain from smoking for 24 hours before one MRI scan. Smoking abstinence will be confirmed using exhaled carbon monoxide breath testing
Ad Lib Smoking	Ad Lib Smoking	Participants will continue smoking as usual (i.e. "ad lib") before one MRI scan and smoke one additional cigarette immediately prior to scanning. Continued smoking will be confirmed using exhaled carbon monoxide breath testing.

Primary Outcome Measures

Name	Time	Method
Blood Oxygen Level Dependent (BOLD) Activation	Approximately 2-4 weeks	BOLD activation in brain reward network regions
Ecological Momentary Assessment (EMA) Pleasure Ratings	2-4 weeks	Anticipated and experienced pleasure based on self-report ratings acquired each day during the EMA phase

Trial Locations

Locations (1)

Hardesty Center for Clinical Research and Neuroscience; 🇺🇸 Tulsa, Oklahoma, United States