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This week, new research from the Harvard School of Public Health suggests that the flavorings in some types of e-cigarettes contain chemicals that have been linked to a rare disease called popcorn lung. There are a lot of questions about what the health risks actually are and what this means for e-cigarettes more broadly

They get it from the tobacco companies

"These (refills) are being sold in hundreds of different flavors, including flavors and colors that would be absolutely appealing to kids," said Kyran Quinlan, M.D., M.P.H., FAAP, chair of the American Academy of Pediatrics (AAP) Council on Injury, Violence and Poison Prevention

Cigarettes combustion creates over 7,000 chemicals, including 69 known carcinogens

Finally, the user inhales the e-liquid through the mouthpiece on the pod itself