Tar and nicotine content of e cigarettes and conventional cigarettes Download Table Nicotine in electronic cigarettes Journal of Umm Al Qura University for Applied Sciences Springer Nature Link 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? E Cigs & Oral Health: How Vaping Affects Gums & Teeth