While smoking and, though uncommon in the UK, betel nut chewing, were risk factors, there also appeared to be an association between air pollution and mouth cancer.
The study concluded: “In conclusion, higher concentrations of PM2.5 may be associated with increased risk of oral cancer in Taiwanese men.
“The mechanism through which this occurs is not clearly understood, hence further investigations are required.”
Furthermore, as this was an observational rather than causational study, it cannot establish course, but can only observe a potential link.
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