Vaping releases toxic chemicals, including heavy metals, as well as ultrafine particles that go deep into the lungs. These increase the risk of heart and lung disorders. The Danger of Chemicals Used in Vape Liquid The Science Blog 5 Vaping Facts You Need to Know Johns Hopkins Medicine Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center High Levels of Fruit flavored Chemicals in E cigarette Liquids Does cannabis create thirdhand smoke? Thirdhand Smoke Resource Center