What's Actually in Your Vape: A Complete Chemical Breakdown Juul e cigarettes were banned in the U.S. What are the vaping rules in Canada? The Globe and Mail New lung scans prove vaping is toxic. The science is officially in. Scans show that teens have developed "popcorn lung" as a result of vaping. It's a permanent, chronic disease that shortens Popcorn Lung: A Dangerous Risk of Flavored E Cigarettes American Lung Association