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Where does radon rank among causes of lung cancer in the United States?

Second leading cause, behind only smoking.

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  1. Second leading cause ✔
  2. The leading cause
  3. Not a known cause

Why: The Surgeon General has warned that radon is the second leading cause of lung cancer. Only smoking causes more lung cancer deaths. It affects non-smokers too.

Huh, didn't know that: Radon is a radioactive gas from the natural decay of uranium found in nearly all soils.

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References

Answer: Second leading cause. The Surgeon General has warned that radon is the second leading cause of lung cancer. Only smoking causes more lung cancer deaths. It affects non-smokers too.

  1. EPA: A Citizen's Guide to Radon (2016) www.epa.gov/sites/default/files/2016-12/documents/2016_a_citizens_guide_to_radon.pdf
    radon is the second leading cause of lung cancer in the United States today
    Checked 2026-10-10.

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