作者认为相当一部分心血管疾病在病因上确与职业等环境因素有密切关联。吸烟能增加冠心病的发病率已很明确,曾估计氮氧化物、氰化物、砷、镉、放射性同位素及化学致变物等,但看来一氧化碳(CO)和烟碱仍为主要的致病因素。苏兰报道145名不吸烟的铸工中 The author believes that a considerable part of the cardiovascular disease is indeed closely related to environmental factors such as occupations. Smoking increases the incidence of coronary heart disease has been very clear, have been estimated nitrogen oxides, cyanides, arsenic, cadmium, radioactive isotopes and chemical mutagens, but it seems that carbon monoxide (CO) and nicotine are still the main pathogenic factor. Solan reports 145 non-smoking castors