An increasing number of US adults believe e-cigarettes are as or more harmful to health than cigarettes, research finds. There is growing evidence that their short-term health risks are substantially less but this perception may deter some adult smokers from switching to e-cigarettes.

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An increasing number of US adults believe e-cigarettes are as or more harmful to health than cigarettes, research finds. There is growing evidence that their short-term health risks are substantially less but this perception may deter some adult smokers from switching to e-cigarettes.