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the claim
Radon gas in homes is the second leading cause of lung cancer after smoking.
the verdict
SUPPORTED
the evidence backs this
Recorded sources
11 sources for · 0 against
Is it true that radon gas in homes is the second leading cause of lung cancer after smoking?
Yes. Multiple peer-reviewed reviews and public health sources state that radon exposure, including residential radon, is the second leading cause of lung cancer after smoking or tobacco use. The claim matches what these sources assert.
Verdict: SUPPORTED · 11 sources for, 0 against · Last checked
Evidence for · 11
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Does residential radon cause lung cancer?. (2017). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/38177/does-residential-radon-cause-lung-cancer
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More for · 10
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Radon, Smoking, and Lung Cancer: The Need to Refocus Radon Control Policy - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.2105/AJPH.2012.300926
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PC, R. & M, K. (2026). Radon-Induced Radiation Biomarkers: A Scoping Review from Exposure Dosimetry to Early Biological Effects on the Lung.. doi.org. https://doi.org/10.3390/ijms27104391
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TM, B., P, K., E, G., JM, G., & W, P. (2026). Radon and Non-Cancer Pulmonary Health Effects in Children: A State of The Art Review.. doi.org. https://doi.org/10.1002/ppul.71615
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Giraldo-Osorio, A., Ruano-Ravina, A., Varela-Lema, L., Barros-Dios, J. M., & Pérez-Ríos, M. (2020). Residential Radon in Central and South America: A Systematic Review.. doi.org. https://doi.org/10.3390/ijerph17124550
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Radon and Lung Cancer: Current Trends and Future Perspectives. (n.d.). cir.nii.ac.jp. https://doi.org/10.3390/cancers14133142
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Radon Gas as the Risk Factor of Lung Cancer in Manipur, India: A Review. (2026). hal.science. https://hal.science/hal-05645399v1
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Characteristics of thoron and thoron progeny in Canadian homes. (n.d.). cir.nii.ac.jp. https://doi.org/10.1007/s00411-010-0338-5
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Radon. (2001). doi.org. https://doi.org/10.3322/canjclin.51.6.337
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Hassanvand, H., Dehghan, N., Naddafi, K., Hassanvand, M., Nabizadeh, R., & Faridi, S. (2019). Measurement of radon concentration in indoor air of residential and public buildings in Nourabad Mammasani city and estimation of its effective dose. ijhe.tums.ac.ir. http://ijhe.tums.ac.ir/article-1-6126-en.html
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Variation of soil radon concentrations in southern Ontario. (2008). doi.org. https://doi.org/10.1093/rpd/ncn192
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