TPCB: E Cigarettes Not All E Cigarettes are the Same: What Parents Need to Know Bench Press , The notion that vaping causes "popcorn lungs" due to diacetyl in e liquids is based on outdated information.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 Chemicals found in e cigarettes could cause lung problems The Pharmaceutical Journal FDA's proposed e cigarette rules draw mixed review