FACT: Most e cigarette users also smoke cigarettes, a pattern known as dual use. This means the tobacco industry isn't helping people quit; it's sustaining addiction through another product. While the industry claims Calling It Quits: Resources for Teenagers on Vaping and Nicotine Cessation Teens inhale cancer causing chemicals in e cigarettes E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA