3、这方面的研究人员大都相信吸卷烟是产生肺癌、喉癌的重要因素，还认为膀胱癌、口腔癌也与此有关。男性吸烟者的心脏病死亡率比不吸烟的高。大多数医生和研究人员认为，上述那些关系已得到令人满意的证实，并且告诫说：戒烟吧，如果你不会抽那可不要学!

　　4. Some competent physicians and research workersthough their small number is decreased even furtherare less sure of the effect of cigarette smoking on health. They consider the increase in respiratory diseases and various forms of cancer may possibly be explained by other factors in the complex human environment atmospheric pollution, increased nervous stress, chemical substances in processed food, or chemical pesticides that are now being used by farmers in vast quantities to destroy insects and small animals. Smokers who develop cancer or lung diseases, they say, may also, by coincidence, live in industrial areas, or eat more canned food. Gradually, however, research is isolating all other possible factors and proving them to be statistically irrelevant.

　　4、有些精通业务的医生和研究人员虽然这些人不多，并且人数在进一步减少不那么肯定吸卷烟对人体健康有影响。他们认为呼吸系统疾病和各种癌症的增多也许可以说是由于人类复杂环境中另外一些因素，即：空气的污染、人们精神压力的增大、经过加工的食品中的化学物质、或化学杀虫药引起的。农民现在大量使用这些农药杀死昆虫和小动物。据他们说，那些患了癌症或肺病的人可能恰巧也住在工业区，或是吃了更多的罐头食品。但是研究工作逐渐排除了其它因素的可能性，并且用统计数字证明这些因素是无关的。

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