Flavourings make e cigarettes more harmful. Another good reason to ban them SEATCA The Danger of Chemicals Used in Vape Liquid The Science Blog E cigarettes almost always contain nicotine. Vaping can expose you and others around you to harmful chemicals, such as: The 101 on e Cigarettes Infographic 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. Vaping Dangers: What Parents Should Know Attorney General Brian Schwalb