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A growing body of evidence suggests the potential harm of vaping electronic cigarettes has been underestimated. While e-cigarette advertisements claim the devices can help people quit smoking cigarettes, research shows that they also targeted non-smoker teens, and scientists are discovering that e-cigarettes can cause serious harm on their own. [...] Scientists from the University of North Carolina, Chapel Hill found that, in a sample of 14 vapers, all those individuals had elevated levels of protease enzymes in their lungs. [...]