What Happens When You Quit Smoking and Start Vaping? Juul boosted: Study establishes e cigarettes as effective smoking cessation tool 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 E cigarettes didn't help smokers quit, study says CNN E cigarettes should be offered to smokers, say doctors BBC News