About E Cigarettes (Vapes) Smoking and Tobacco Use CDC Vaping isn't just vapor. It's an aerosol filled with nicotine and chemicals that go deep into your lungs and straight into your bloodstream. Many vapes contain: Highly addictive nicotine 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. The Health Effects of Vaping Indoors Indoor Doctor The Danger of Chemicals Used in Vape Liquid The Science Blog Composition of electronic cigarette aerosol Wikipedia