Trends in U.S. E cigarette Sales Measured in Milligrams of Nicotine, 20192024 ScienceDirect Vaping Percentages UW CTRI UWMadison 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 Juul May Have Started a Nicotine Arms Race in San Francisco, Where E Cigs Are Now Banned Business Insider