Do Crystal Bar Vapes Have Diacetyl? Vapor Shop Direct Ah yesvaping studies saying they contain diacetyl. : r Vaping Diacetyl Causing "Popcorn Lung" is Overblown Media Hype 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. Dr Farsalinos E Liquid Study Finds Diacetyl Present