, The notion that vaping causes "popcorn lungs" due to diacetyl in e liquids is based on outdated information.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 Diacetyl in Vape Juice: The Facts We Know Pod Salt UK Chemicals in e cigarettes may put users at risk A Kernel of Truth: Diacetyl, Popcorn Lung and E Liquids Dinner Lady List of Diacetyl Free U.S. Vendors : r electronic_cigarette Diacetyl & Popcorn Lung EDGE Vaping