Occupational carcinogens - responsible for at least 152 000 cancer deaths per year.

职业中的致癌物质—每年至少导致152 000例癌症死亡。

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Participants: Former and current nuclear weapons workers, 45 years old, including smokers and never-smokers, with variable exposure to occupational lung carcinogens.

参与者：农民和在职的核武器工人，45岁，包括有吸烟史与无吸烟史，并且有职业性的肺致癌物的接触史。

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