Researchers Find Toxic Metals in E Cigarette's Johns Hopkins Bloomberg School of Public Health Nonnicotine vapes may be marketed as safe, but many still contain chemicals, have unknown health effects, and aren't FDAregulated. Teens are using them more ofteneven alongside nicotine vapes. No ecigarette is risk free. Health Effects of Vaping Vaping Related Illness and Lung Disease NEJM Heated Tobacco Products, Cigarettes, and E Cigarettes: What's the Difference PMI Science Public Health Consequences of E Cigarettes