At a radon level of 4 pCi/L, what is the risk of lung cancer for smokers?

At a radon level of 4 pCi/L, the risk of lung cancer for smokers is significantly elevated due to the synergistic effects of radon exposure and smoking. Research has shown that smokers exposed to this level of radon have a much higher risk compared to non-smokers. Studies indicate that the risk of lung cancer for smokers at this radon level can be approximated to about 62 per 1,000 smokers, reflecting the compounded dangers of inhaling radon and tobacco smoke.

This increased risk is attributed to the way both radon and tobacco interact with lung tissue, enhancing the probability of carcinogenic effects. When assessing health risks associated with radon exposure, it is crucial to consider lifestyle factors such as smoking, as they can substantially alter risk assessments. The other provided options reflect lower risks that do not account for this interaction to the same extent, underscoring why the 62/1,000 figure for smokers at 4 pCi/L is widely recognized as an accurate representation of increased lung cancer risk.