More cancer patients are vaping UPI.com 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, E cigarettes: 'cancer risk close to zero' Bhekisisa We were shocked': Vaping considerably increases lung cancer risk among people who smoke Do e cigarettes cause cancer? Vaping Post