A new study is prompting more concerns over the nation's largest e-cigarette company as investigators probe whether Juul made health claims without government approval.
Connecticut's attorney general is accusing Juul of marketing itself as a "smoking cessation device" without approval from the U.S. Food and Drug Administration.
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Recently released research from Yale and Duke universities found an unexpected chemical reaction in some Juul e-cigarette flavors that could lead to lung irritation.
When the vape juice is heated, the study discovered a type of chemical called "acetals" in Juul's popular creme brulée flavor. Acetals prompt the respiratory system to become inflamed, and they aren't listed on the label.
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Juul told ABC News that the study created a measurement of exposure that would never be found in real-world use.