Fact
Research shows a link between increased nicotine use and feelings of depression, meaning the more you use it, the more depressed you may feel.
Source 1:
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