Comparison of Nicotine Levels Between Cigarettes and Vapes Ecigator E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA How Do Electronic Cigarettes Work? UPMC HealthBeat 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 Teens use Juul e cigarettes much more often than other vaping products