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Adolescents who vape cannabis are at greater risk for respiratory symptoms indicative of lung injury than teens who smoke cigarettes or marijuana, or vape nicotine, a new University of Michigan study suggests.

The result challenges conventional wisdom about vaping nicotine, says the study’s principal investigator, Carol Boyd, [...]
“I thought that e-cigarettes (vaping nicotine) would be the nicotine product most strongly associated with worrisome respiratory symptoms,” she said. “Our data challenges the assumption that smoking cigarettes or vaping nicotine is the most harmful to the lungs. [...]