Tar and nicotine content of e cigarettes and conventional cigarettes Download Table 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, How Many Puffs of a 20MG Vape Is Equal to a Cigarette? 3 Charts Visual Study: The Link Between Vaping and Smoking in Kids