Public Health Consequences of E Cigarettes Heated Tobacco Products, Cigarettes, and E Cigarettes: What's the Difference PMI Science 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. e Cigarettes Affect Oral Health and Ways to Minimise the Side Effects Researchers Find Toxic Metals in E Cigarette's Johns Hopkins Bloomberg School of Public Health Vaping Related Illness and Lung Disease NEJM