For the current study, nicotine users will use an electronic cigarette in addition to their usual nicotine source for 4 weeks. The electronic cigarette will contain sweet or tobacco flavored liquid that may or may not contain nicotine. Participants will complete functional magnetic resonance imaging scans at the beginning and end of the study to measure how the brain responds to the electronic cigarette flavor.

There will be two remote visits and two in person visits. There will be a MRI during each in person visit and the subject will be given an study electronic cigarette to use between the two MRI visits.

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