Many smokers use tobacco products while eating or drinking alcohol in public. The American state of Massachusetts banned smoking in almost all restaurants and workplaces four years ago.

许多吸烟者在公共场合吃东西或喝酒的时候吸烟。四年前，美国马塞诸塞州在几乎所有的旅馆和工作场所禁烟。

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Risk factors include smoking, alcohol, human papillomavirus infection, sun exposure and chewing tobacco or similar substances.

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