Final answer:
Lung cancer is more prevalent in smokers, but can also occur in non-smokers due to other risk factors. Prevalence of lung cancer in non-smokers, females, and Asians can vary depending on specific populations and their risk factors.
Step-by-step explanation:
Lung cancer is more prevalent in smokers compared to non-smokers, and cigarette smoking is the leading cause of lung cancer. However, lung cancer can also occur in non-smokers due to other risk factors such as exposure to secondhand smoke, environmental pollutants, and genetic factors. The prevalence of lung cancer in non-smokers, females, and Asians can vary depending on the specific populations and their respective risk factors.