How do vapes work and what chemicals are inside them? BTN High Composition of electronic cigarette aerosol Wikipedia About E Cigarettes (Vapes) Smoking and Tobacco Use CDC Vapes on black market may contain toxic chemicals, pesticides, harmful flavorings Eliminating Tobacco Use in Washington Kids American Heart Association 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.