Nicotine, propylene glycol, sweet flavorings, and various toxic chemicals like carcinogens and heavy metals are found in vape juice, posing health risks, especially to youth. What is Vape Juice? E Cigarette Direct 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. Vaping It's On The Increase Mount Lawley Orthodontics Vaping lung illness: Harmful chemicals found in e cig flavoring juice Study Measures the Effects of JUUL Vaping on Users and their Surrounding Environment Thirdhand Smoke Resource Center