Smokers between the ages of 18-50 who smoke at least 10 cigarettes per day will be asked to undergo a screening visit where they will be asked to complete questionnaires about their mental health and complete lab assessments. All qualified participants will be asked to participate in two 5-day long out-patient test phases where they will undergo 3 brain-imaging scans, blood draws, and remain abstinent from smoking. Participants will be compensated for study participation.
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