50.（In the United States, forinstance, the mortality rate for lung cancer among female non-smokers has notchanged during the past 20 years. During the same period the rate among femalesmokers has increased by a factor of half.）In South-East Asia, mor

50.（In the United States, forinstance, the mortality rate for lung cancer among female non-smokers has notchanged during the past 20 years. During the same period the rate among femalesmokers has increased by a factor of half.）In South-East Asia, more than 85 percent oforal cancer cases in women are caused by tobacco habits.

例如，在美国，在过去的20年中非吸烟女性中肺癌的死亡率并未发生变化。而同期该比率在吸烟女性中增加了一半。