Asbestos Contractor/Supervisor Practice Exam

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By how much is the incidence of lung cancer greater in asbestos workers who smoke compared to non-asbestos workers who do not smoke?

5-10 times
20-30 times
50-90 times
100-150 times

The correct answer is: 50-90 times

The incidence of lung cancer in asbestos workers who smoke is significantly higher than in non-asbestos workers who do not smoke, primarily because the combination of asbestos exposure and smoking greatly compounds the risk of developing lung cancer. Research indicates that asbestos exposure increases the risk of lung cancer inherently, and when this is coupled with the effects of smoking, the risk escalates substantially. Specifically, it has been documented that the incidence rate for lung cancer can increase by 50 to 90 times for individuals who are exposed to asbestos and also smoke. This stark increase is attributed to the synergistic effects of both risk factors, as asbestos fibers can cause cellular damage in lung tissue, and smoking introduces a range of carcinogens that further contribute to cancer development. In comparison, while other ranges like 5-10 times or 20-30 times suggest a lesser degree of risk, they do not accurately reflect the overwhelming evidence indicating the severe risks associated with both asbestos exposure and smoking. Therefore, 50-90 times is a more accurate representation of the increased risk for lung cancer in this specific population.