The FDA doesn't know if flavored vaping chemicals are safe to breathe Salon.com What Vapes Contain Diacetyl and How Can We Stay Safe? Diacetyl & Popcorn Lung EDGE Vaping Diacetyl in Electronic Cigarettes: What you need to know! E Cigarette Direct 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.