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Risk factors for oral cancer in newly diagnosed patients aged 45 years and younger: a casecontrol study in southern England

This is particularly dangerous because South Korea has the second-highest rate of smokers globally (behind Eastern Europe) (42)

For those indices that we did consider where there were substantial amounts of data daily amount smoked, duration, age of starting to smoke, and time of quit (relative both to current smoking and to never smoking) there was very clear evidence that greater exposure leads to greater risk, not only for all lung cancer, but also for squamous and adeno

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