網(wǎng)友正在提問
肺癌是發(fā)病率和死亡率增長最快,對人群健康和生命威脅最大的惡性腫瘤之一。近50年來許多國家都報道肺癌的發(fā)病率和死亡率均明顯增高,男性肺癌發(fā)病率和死亡率均占所有惡性腫瘤的第一位,女性發(fā)病率占第二位,死亡率占第二位。肺癌的病因至今尚不完全明確,大量資料表明,長期大量吸煙與肺癌的發(fā)生有非常密切的關(guān)系。已有的研究證明:長期大量吸煙者患肺癌的概率是不吸煙者的10~20倍,開始吸煙的年齡越小,患肺癌的幾率越高。
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