Which of the following is a primary health risk associated with radon exposure?

The primary health risk associated with radon exposure is lung cancer. Radon is a naturally occurring radioactive gas that can accumulate in homes and buildings, particularly in areas with high levels of uranium in the soil. When radon gas is inhaled, its decay products can damage the lung tissue and potentially lead to the development of lung cancer over time.

The relationship between radon exposure and lung cancer risk has been well-established through numerous scientific studies. In fact, radon is considered the second leading cause of lung cancer after smoking. The risk is particularly heightened for smokers, as the combination of tobacco smoke and radon exposure significantly increases the likelihood of developing lung cancer.

Other health risks listed, such as skin cancer and heart disease, are not directly linked to radon exposure. Skin cancer is primarily associated with ultraviolet radiation, while heart disease stems from various factors including lifestyle and genetic predispositions, rather than radioactive gas exposure. Bone cancer also does not have a direct association with radon, as it typically relates more to various other environmental and genetic factors.