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| Estimated lung cancer risks from |
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| lifetime exposure to radon |
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| Percent risk |
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| of lung cancer |
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| in smokers |
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| Percent risk |
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| of lung cancer |
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| in non smokers |
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| 1 pCi/l |
| 0.7% |
| 0.05% |
| 4 pCi/l |
| 3% |
| 0.2% |
| 20 pCi/l |
| 14% |
| 1% |