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A couple more possibilities could be that smokers are less likely to notice any symptoms they might have, or are less likely to report those symptoms and get a
by hkeide 6y ago
A couple more possibilities could be that smokers are less likely to notice any symptoms they might have, or are less likely to report those symptoms and get a test. Smokers are probably less conscientious on average - it's almost the definition of lack of conscientiousness.