Electronic cigarettes: A safe substitute? New Scientist 5 Vaping Facts You Need to Know Johns Hopkins Medicine 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 riskfree. E Cigarettes Fact Sheet Center for Public Health and Tobacco Policy Are e cigarettes safe? Health effects of electronic cigarettes Wikipedia