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100 people on Hainan Island were studied for their smoking and chewing habits and the condition of their oral mucosa. Ninety-five percent of the study population chewed areca (betel) nut. In men this habit was supplemented with either smoking cigarettes or water pipe. In two men a small commissural leukoplakia was found. In three women clinical and histologic changes pointed towards oral submucous fibrosis.
Pindborg et al. (Fri,) studied this question.