why is chewing tobacco carcinogenic The signs don't always show, but the damage already underway. raises your risk of oral cancer by 6 to 7 times. Take a moment to think about the risks Tobacco and Cancer | Cancer
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Archived from the original on November 7, 2016

Others at risk include people who spend large amounts of time outside, like agricultural workers, people who are homeless (and cant get out of the smoke), and athletes, who might keep exercising at high levels, Avol says

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Research suggests that this is not the case

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This is another reason that children are so prone to middle ear infections