Are E cigarettes Safe? Women's Health Research Institute , The notion that vaping causes "popcorn lungs" due to diacetyl in e liquids is based on outdated information.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 An updated overview of e cigarette impact on human health Respiratory Research Springer Nature Link How Many Puffs of a 20MG Vape Is Equal to a Cigarette? Heated Tobacco Products, Cigarettes, and E Cigarettes: What's the Difference PMI Science