E Cigarette How E Cigarettes Work, Health Risks & Teen Use British American Tobacco Announces Closure of its Intellicig Ecig Brand Electric Tobacconist Teens' e cigarette use linked with later smoking The Boston Globe Illustration of the four generations of e cigarette or vaping products. Download Scientific Diagram Study suggests uncertainty in e cigarettes' usefulness for quitting smoking Harvard Gazette Harvard scientist finds microbial contaminants in e cigs Harvard Gazette