E liquides THC pour une vape et un puff intense Vaping, even without nicotine, can cause harmful cardiovascular effects, Penn study finds PhillyVoice 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. New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking