相較於遺傳性的基因缺陷，生活方式對於癌症的發生並沒有決定性的影響，這是很重要的一個觀念，現今所謂的危險因子，雖然都是經過流行病學的嚴謹分析而得出的結論，但是科學的結論必須要在嚴格的條件控制之下才會成立。雖然抽菸的確會提高罹患肺癌的機�

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