E Cigarette How E Cigarettes Work, Health Risks & Teen Use Court rules Juul can still sell e cigs while it prepares challenge to FDA ban 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. FDA clears first menthol e cigarette for adults