More cancer causing chemicals found in electronic cigarettes The Verge E cigarettes and cancer The Side Effects and Cancer Risk Associated with Vaping 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, Growing the research evidence on e cigarettes by Research at CRUK Medium