What is e Cigarette and Associated Health Risks IntechOpen E Cigarette How E Cigarettes Work, Health Risks & Teen Use 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, Which is more harmful: e Cigarettes or regular cigarettes?