Diacetyl: Is it a danger for the e liquid? Our expert advice! A&L Which brands contain diacetyl in their vape juices? Knowledge Kaiweili Digital Technology Are Airis Beast Flavors Safe to Use? Clutch Vape , The notion that vaping causes "popcorn lungs" due to diacetyl in e liquids is based on outdated information.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 Research indicates that certain flavoring chemicals used in e cigarettes can irritate lung tissue and trigger inflammatory responses in laboratory settings. Some compounds, such as diacetyl, have been linked to respiratory damage when E Cigarettes and Vaping PPAC Central