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What is the leading cause of lung cancer for non-smokers?

  1. Asbestos

  2. Radon

  3. Coal Dust

  4. Secondhand Smoke

The correct answer is: Radon

Radon is recognized as the leading cause of lung cancer among non-smokers. It is a naturally occurring radioactive gas that can accumulate in homes and buildings, particularly in areas that are poorly ventilated or have high uranium content in the soil. When radon gas is inhaled, its radioactive particles can damage lung tissue, leading to an increased risk of cancer over time. This risk is particularly concerning because radon exposure can occur without individuals knowing they are at risk, as it is invisible, tasteless, and odorless. Asbestos, while known to cause various forms of cancer, primarily affects individuals who have had significant occupational exposure. Coal dust also poses health risks and is associated with conditions like pneumoconiosis rather than being a major direct cause of lung cancer in non-smokers. Secondhand smoke is a significant risk factor overall and can contribute to lung cancer, particularly for non-smokers who are frequently exposed to tobacco smoke, but it is not as prevalent as radon in the context of non-smokers specifically developing lung cancer. Thus, the association of radon with lung cancer risk is clearly established, making it the leading cause among non-smokers.