Back to School: More than 2.1 million teens currently use e cigarettes, with one in four reporting daily use. New brands and product types continue to appear on the market at an extremely Trends in U.S. E cigarette Sales Measured in Milligrams of Nicotine, 20192024 ScienceDirect 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 Which e cigarette is most like my favourite cigarette? : The Electric Tobacconist Ltd.