A sweeping scientific review is raising new concerns about the long term health effects of vaping. Nicotine based e cigarettes may pose a serious cancer risk, according to a major new review that challenges the A scientific review has raised fresh concerns about the long term cancer risks of vaping, concluding that e cigarettes are probably carcinogenic, while also acknowledging significant gaps in the evidence. The analysis of reviews F.D.A. Delays Decision on Juul's E Cigarettes but Orders Others Off the Market The New York Times E cigarette use is linked to higher heart attack risk, especially in former smokers