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Smoking is harrnful to health. Medical science has now proved that smoking cancause lung cancer and other diseases such as emphysema. Your chances of having a heartattack also increase the more you smoke. Smoking is dafinitely a health hazard. 吸烟对健康有害。医学已经证明吸烟能引起肺癌和其它疾病, 如肺气肿。吸烟越多, 得心脏病的机会也会增加。无疑吸烟对健康有害。
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