The answer is A. Smoking cigarettes
While most of these would cause a risk lung cancer, they are not voluntary. You can't control air pollution or a family history of lung cancer. However, you can control smoking cigarettes and you chose to smoke them so that would be a voluntary risk of getting lung cancer.
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A is the answer. This is because this was not covered by the Twin studies.
Good luck!
-RxL
I had a lab and she had 6 pups all together but only 5 survived.
