I don't have any medical information to back me up, but I'm of the opinion you can still get mouth, jaw, throat, etc (oral) cancers since it's foreign carcinogens being introduced into your body. Just like with tobacco chews, you don't swallow but it's still foreign substance in your body....
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I don't care if you are black, white, purple, green, Chinese, Japanese, Korean, hippie, cop, bum, admin, user, English, Irish, French, Catholic, Protestant, Jewish, Buddhist, Muslim, indian, cowboy, tall, short, fat, skinny, emo, punk, mod, rocker, straight, gay, lesbian, jock, nerd, geek, Democrat, Republican, Libertarian, Independent, driver, pedestrian, or bicyclist, either you're an asshole or you're not.
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