Smoking is, of course, bad. E-cigarettes are not smoking, it is instead a nicotine vapor. The number of people who have gotten lung cancer from nicotine vapor is zero, which is not evidence for much, but it is certainly not evidence it is harmful. Since even among lung cancer patients, 50 percent have never smoked, smoking itself is only a risk factor. E-cigarettes are not even that.But for asthmatics it’s a bad idea. That would seem to be common sense. An article in Annals of Allergy, Asthma&Immunology, focuses on those risks, and highlights dependence on nicotine and the dual use of e-cigarettes and regular cigarettes. How many people have died of nicotine dependence in history? There’s less evidence for that than there is second-hand smoke.The authors say that smoking cessation benefits of e-cigarettes haven’t been proven.”Despite the apparent optimism surrounding e-cigarettes and their purported therapeutic role in smoking cessation, there just simply is not enough evidence to suggest that consumers should use e-cigarettes for this purpose.” said allergist Andrew Nickels, MD, lead author, ACAAI member, Mayo Clinic Division of Allergy and Immunology.