We are working on a Johns Hopkins-approved research study about e-cigarette use. This research is being done to learn how stopping use from e-cigarettes impacts mood and behavior. Screening for this study involves an initial phone screening and an in person 2-3 hour screening visit. If you qualify, this study requires a one week stay at a residential research unit at Johns Hopkins University Bayview Campus and a one week follow-up visit. You can earn up to $1,900 for completing the study.