if u smoke cigarettes What Happens to Your Body, When You Take a Puff of a Cigarette? Smoking and High Blood Pressure:
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however, this has not been proven yet due to lack of research on long-term effects from using e-cigarettes

"Although our research was not done on humans, people should be aware that hotel rooms, cars, and homes that were occupied by smokers are very likely to be contaminated with THS," said Martins-Green, in a statement
Camel of the 90s

Steps You Can Take to Protect Yourself You cannot protect yourself from defectively manufactured or assembled e-cigarettes