Study Measures the Effects of JUUL Vaping on Users and their Surrounding Environment Thirdhand Smoke Resource Center 8 Vape Juice Ingredients to Avoid Toxic e Liquid Flavors Unveiling the Ingredients of Vape Juice What's Inside Your Vape Juice Vape King Blog 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. 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.