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 E cigarettes draw fans as states and FDA question safety Stemming the E Cigarette Epidemic Cancer Today POV: FDA Restricts Flavored E cigarettes, but Not the Real Killers. Huh? BU Today Boston University