化学致癌物对人类癌症具有重要意义。仅以吸烟者的肺癌而论,已有令人信服的证据。可以认为,人类的大部分癌症是由于长期接触各种致癌物质引起的。看来通过限制或消除对致癌物质的接触,可以减少癌的危险性。为此,必须鉴定出环境中的这些物质。为 Chemical carcinogens are of great importance to human cancer. There is compelling evidence that smokers only have lung cancer. It can be assumed that most cancers in humans are caused by long-term exposure to various carcinogens. It appears that by limiting or eliminating contact with carcinogenic substances, the risk of cancer can be reduced. For this reason, these substances in the environment must be identified. for