Smoking Abstinence and Lapse Effects in Smokers With Schizophrenia and Controls
Trial Snapshot
- Phase
- Phase 2
- Status
- Completed
- Sponsor
- Brown University
- Enrollment
- 60
- Locations
- 1
- Primary Endpoint
- urge to smoke
Study Overview
Brief Summary
This project tests two hypotheses concerning the low smoking cessation rates in smokers with schizophrenia. The first hypothesis is that smokers with schizophrenia experience stronger and more sustained effects of smoking abstinence on negative mood and smoking urge than control smokers without psychiatric illness. The second hypothesis is that smokers with schizophrenia experience stronger reinforcing effects of a smoking lapse (i.e., more rewarding effects of smoking after a period of abstinence) than control smokers without psychiatric illness.
Detailed Description
In this study, smokers with schizophrenia and smokers without psychiatric illness participate in a nicotine preference task before and after a 3-day period of continuous smoking abstinence. The investigators will experimentally control abstinence by providing participants with high-value cash incentives contingent upon smoking abstinence verified with breath carbon monoxide levels. The investigators will measure nicotine withdrawal and smoking urge during the abstinence period. In the nicotine preference task, participants will make choices between nicotine-containing and denicotinized cigarette puffs to provide a measure of nicotine reinforcement, and the investigators will also measure the effects of smoking on mood. After the second nicotine preference task, participants will receive a small-value reinforcer if they continue to abstain for another day, and the investigators will measure time to the second lapse.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Basic Science
- Masking
- Double (Participant, Outcomes Assessor)
Eligibility Criteria
- Ages
- 18 Years to — (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •cigarette smokers, 20-50 cigarettes per day
- •schizophrenia or no psychiatric illness
- •age 18 or older
- •male or female
Exclusion Criteria
- •unstable symptoms or medication
- •not interested in quitting smoking within 6 months
Arms & Interventions
schizophrenia
Smokers with schizophrenia or schizoaffective disorder
Intervention: smoking abstinence (Behavioral)
non-psychiatric
smokers without psychiatric illness
Intervention: smoking abstinence (Behavioral)
Outcomes
Primary Outcomes
urge to smoke
Time Frame: 3 days
craving for smoking
positive and negative mood
Time Frame: before and after 3 days of abstinence
positive and negative mood scale
Withdrawal symptoms
Time Frame: 3 days
negative mood related to nicotine withdrawal
nicotine preference
Time Frame: before and after 3 days of abstinence
choice for nicotine puffs versus denicotinized cigarette puffs
Secondary Outcomes
- time to lapse(192 hours)
Investigators
Jennifer Tidey
Associate Professor (Research)
Brown University