Electronic cigarettes (e cigarettes) are sometimes called e cigs, vapes, vape pens, and electronic nicotine delivery systems (ENDS). E cigarettes come in many shapes and sizes. Most e cigarettes contain nicotine. Get the facts about e cigarettes, Broad evidence implicates e cigarettes as a cause of cancer Stanton Glantz blog Misconceptions about e cigarette safety might be stopping smokers using them to quit E cigarettes: 'cancer risk close to zero' Bhekisisa