Ah yesvaping studies saying they contain diacetyl. : r Vaping Vuse Pod Not Working? Common Causes and Fixes 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. F.D.A. Authorizes E Cigarettes to Stay on U.S. Market for the First Time The New York Times