Most e cigarettes (vapes) contain nicotinethe addictive drug in regular cigarettes, cigars, and other tobacco products. Nicotine can harm the adolescent brain which continues developing until about E Cigarettes and Teens Medical Associates of Northwest Arkansas E Cigarettes: Know the Health Risks Department of Health Which e cigarette is most like my favourite cigarette? : The Electric Tobacconist Ltd. Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America