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大量流行病学和病因学研究已经证明,肺癌的发病原因主要是长期吸入有害的污染空气所引起。有些工矿和生活环境的污染空气中含有致癌或/和促癌物质,长期吸入这些物质可以诱发肺癌和其他癌症。吸烟也是一种小范围但浓度更高的空气污染,它的烟焦里含有多种致癌物质,可以诱发肺癌和其他癌症。医学统计表明,约有75～80%的肺癌是长期吸烟引起的,就肺癌的发病而论,吸烟比大气污染的害处更
A large number of epidemiological and etiological studies have shown that the cause of lung cancer is mainly caused by long-term inhalation of harmful polluted air. Some industrial and mining and living environment polluting air contains carcinogenic or/and carcinogenic substances. Inhaling these substances for a long time can induce lung cancer and other cancers. Smoking is also a small but higher concentration of air pollution. Its smoke coke contains a variety of carcinogens that can induce lung cancer and other cancers. Medical statistics show that about 75% to 80% of lung cancer is caused by long-term smoking. As for the incidence of lung cancer, smoking is more harmful than atmospheric pollution.