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However, the authors also emphasize that these studies only amount to a level of limited evidence, and that [w]hether or not the levels of exposure are high enough to contribute to human carcinogenesis remains to be determined. Additionally, [t]here is no available evidence whether or not e-cigarette use is associated with intermediate cancer endpoints in humans, the report says

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Among 10th graders, 16% said they used an e-cigarette and 7% said they used a tobacco cigarette in the same time period

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He could make out no scratches on the foredeck of the smaller boat