There are several ways to cause lung cancer.First,smoking is the major factor leads to lung cancer .The materials of cigarette are tobacco leaves with toxic substances and chemical carcinogen; therefore it cause heavy smoker and get higher probability of the lung cancer.Especially,although you are a non-smoker,you might have chance to get lung cancer by smoke generated by smokers.
我的英作文 What causes Lung Cancer There are several ways to caus
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