Ah yesvaping studies saying they contain diacetyl. : r Vaping , The notion that vaping causes "popcorn lungs" due to diacetyl in e liquids is based on outdated information. , ., While diacetyl was once used as a flavoring agent in some e liquids and linked to Understanding Popcorn Lung and Diacetyl: Risks and Prevention Vapestore Blog 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.