The Mysterious Vaping Illness That's 'Becoming an Epidemic' The New York Times 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 age 25. Using nicotine in adolescence Why Do I Feel Sick After Vaping? Here's What You NEED to Know! What Happens if You Swallow Vape Juice? EDGE Vaping Psychiatry.org E Cigarettes and Vaping Understanding Vaping: Can It Cause Sickness?