UPI reports e-cigarette users are inhaling unknown ingredients that are irritating their air passageways. When people vape, a chemical reaction forms in which vanilla-flavored glycerols turn to acetals. Researchers created a "vaping machine" to test eight different flavors of Juul refill cartridges. They found four of those flavors included menthol, which can increase nicotine cravings. The nicotine content of e-cigarette flavorings are equal to two packs of tobacco cigarettes.
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