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. Is Vaping Better Than Smoking? American Heart Association E cigarette flavors are toxic to white blood cells, warn scientists Is Vaping Safer than Smoking? New Directions for Women