Electronic cigarette Wikipedia The evolution of electronic cigarettes. (A) Illustration of first, Download Scientific Diagram What are heated tobacco products, what's in them and how do they work 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,