Research shows a link between increased nicotine use and depression, meaning the more you use it, the higher your risk of depression.

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Bi-directional associations of electronic and combustible cigarette use onset patterns with depressive symptoms in adolescents William V. Lechner,a,* Tim Janssen,a Christopher W. Kahler,a Janet Audrain-McGovern,b and Adam M. Leventhalc


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