Not just water vapor: why e cigarettes are so dangerous PUBLIC HEALTH INSIDER The Promise of Vaping and the Rise of Juul The New Yorker Vaping: What Teens and Parents Should Know Pediatrics Northwest Diacetyl in Vape Juice: The Facts We Know Pod Salt UK Diacetyl In Juul Pods Juul Pods 6pk Case 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.