The FDA's flavored e cigarette guidance could keep adult smokers from safer alternatives Unraveling the Truth: Is Nicotine Truly a Depressant? Vaping Possible Negative Effects on Lungs: State of the Art From Lung Capacity Alteration to Cancer Cureus E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) Switching from smoking to vaping dramatically reduces cancer risk Dr Colin Mendelsohn Vaping Safety, Smoking, Dangers, Pros, Cons, Debate, E cigarettes, & Tobacco Britannica