E cigarettes are still 'a bet' and diseases may emerge within 10 or 20 years, warns Imperial College Clear The Air News Tobacco Blog Clear The Air News Tobacco Blog Almost one million Brazilians regularly use e cigarettes : Revista Pesquisa Fapesp Explainer: What are e cigarettes? 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 and Teens Medical Associates of Northwest Arkansas JUUL E Cigarettes Harrison County Health Department