Does Diacetyl In Vaping Cause Popcorn Lung? SMOKO E Cigarettes 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. How do I figure out if my vape juice contains diacetyl or not? : r Vaping Ah yesvaping studies saying they contain diacetyl. : r Vaping