This study is examining how the brain changes as people remain abstinent from smoking cigarettes over the course of approximately 1 year. We are using magnetic resonance imaging (MRI) to investigate how the brain's structure and function change over time in individuals who have recently quit smoking.

Participants will complete five in-person visits over the course of 9 months and 2 follow-up phone interviews at 12 and 15 months after the initial visit. Visits will include blood draws and MRI scans, completion of questionnaires about drug use and emotions, tests of memory and decision making, and urine drug tests. Telephone follow-ups will include questions about nicotine use.

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