1) Radon gas exposure is the second leading risk factor for lung cancer, especially in non-smokers, and high indoor radon concentrations have been found in homes in Galicia, Spain. 2) A recent study of lung cancer cases in never smokers found that radon levels in homes of cases were on average three times higher than typical levels for the general population in Galicia. 3) The study provides evidence that radon exposure can increase lung cancer risk for all histological types, and may have an even stronger influence on small cell and large cell lung cancers.

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