E Cigarettes and Cardiopulmonary Health: Review for Clinicians Circulation Connecticut attorney general continues crackdown on bootleg e cigarettes Do e cigarettes kill you? Researchers don't know. Vox Toxicological Aspects Associated with Consumption from Electronic Nicotine Delivery System (ENDS): Focus on Heavy Metals Exposure and Cancer Risk Circle K, FEMSA affiliate sued over e cigarette sales C Store Dive Harvard scientist finds microbial contaminants in e cigs Harvard Gazette