Is Diacetyl In Juul Pods E Cigarettes JUUL Is Unsafe. We Want You to Know Why. When you vape, you aren't just inhaling vapor. Vape juice also contains addictive nicotine and other toxins! #EliminateTobaccoUse and keep e cigs out of your lungs. [Source: CDC] DYK? Vaping coats lungs with potentially harmful chemicals. This can include chemicals such as: Diacetyl: This food additive, used to deepen e cigarette flavors, is known to damage small passageways in the lungs. Students and Vaping Why Teens Vape and JUUL Health Risks