What percentage of lung cancer cases occur in non-smokers?

The correct answer is that less than 10% of lung cancer cases occur in non-smokers. This statistic highlights the strong correlation between smoking and lung cancer, as smoking is the leading cause of the disease. While the exact percentage can vary depending on population studies and geographic regions, extensive research consistently shows that a vast majority of lung cancer cases are attributed to tobacco use.

Other risk factors for lung cancer do exist, such as exposure to secondhand smoke, radon gas, asbestos, and air pollution, but these contribute to a much smaller percentage of cases among non-smokers. The statistic emphasizes the importance of smoking prevention and cessation programs as a significant public health strategy to reduce the incidence of lung cancer.