疾病病因的研究中贯穿着逻辑思维的灵魂。在吸烟与肺癌关系的流行病学研究方面,研究者们自觉或不自觉地遵循了逻辑思维的规律,应用了逻辑思维的武器,终于阐明了吸烟与肺癌的因果关系,成为慢性病病因探讨方面的一个典型范例。二十世纪前半叶,在一些较发达的国家里,肺癌死亡率稳定地上升。排除了因为老年人口增加,应用放射线检查提高了 The soul of logical thinking runs through the study of disease causes. In the epidemiological study of the relationship between cigarette smoking and lung cancer, researchers consciously or unconsciously followed the laws of logical thinking, applied logical thinking weapons, and finally clarified the causal relationship between smoking and lung cancer, and became the cause of chronic diseases. A typical example. In the first half of the 20th century, the mortality of lung cancer steadily increased in some more developed countries. Eliminate increased use of radiographic examination due to an increase in the elderly population