Secondhand vape exposure: Risks and side effects 5 Vaping Facts You Need to Know Johns Hopkins Medicine Thirdhand Smoke Resource Center Protecting Californians ? () Although often promoted as safer than traditional cigarettes, e cigarettes still harm the body in many ways. 1. Health Risks Most vapes contain nicotine, Juul study shows secondhand vaping emissions are less toxic than cigarette smoke The study could change everything we know about vaping.