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许多国家的流行病学资料证明吸烟是肺癌、慢性支气管炎、肺气肿、局部贫血性心脏病以及阻塞性周围血管病的一个重要病因。还在舌癌、喉癌、食道癌、胰腺癌、膀胱癌以及流产、死胎、新生儿死亡和胃十二指肠溃疡发病中起一定作用。实验证实,纸烟烟气的焦油中存在着致癌物和刺激物,而病理学研究也表明吸烟者和实验动物的支气管上皮细胞有癌前期变化。烟气中已知
Epidemiological data from many countries demonstrate that smoking is an important cause of lung cancer, chronic bronchitis, emphysema, focal anemia and obstructive peripheral vascular disease. It also plays a role in tongue cancer, laryngeal cancer, esophageal cancer, pancreatic cancer, bladder cancer and the incidence of miscarriage, stillbirth, neonatal death and gastroduodenal ulcer. Experiments confirmed that there is carcinogens and irritants in the tar of cigarette smoke, and pathological studies also show that bronchial epithelial cells in smokers and experimental animals have precancerous changes. Known in the flue gas