Juul vape: What is it, why are teens addicted, and is it safe? CNET The FDA's Juul Ban May Not be a Pure Public Health Triumph Juul E Cigarettes Side Effects, Addiction Risks & Teen Use Vaping is often marketed as a safer alternative to smoking, but many vape products contain nicotine, harmful chemicals, and heavy metals that can harm developing brains and lungs. Why is vaping so popular? Devices are sleek and can be highly addictive. Vox Stop 'super cool' e cigarette from taking off among kids, UK told Vaping The Guardian