Smoke

https://www.ucsf.edu/news/2014/03/112316/e-cigarettes-gateway-nicotine-addiction-us-teens-says-ucsf-study


Commentary:

E-cigarettes, promoted as a way to quit regular cigarettes, may actually be a new route to conventional smoking and nicotine addiction for teenagers, according to a new study. In the first analysis of the relationship between e-cigarette use and smoking among adolescents in the United States, researchers found that adolescents who used the devices were more likely to smoke cigarettes and less likely to quit smoking. The study of nearly 40,000 youth around the country also found that e-cigarette use among middle and high school students doubled between 2011 and 2012, from 3.1 percent to 6.5 percent.