The Public Health Service studied the effects of smoking on health, in a large sample of representative
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The Public Health Service studied the effects of smoking on health, in a large sample of representative households. 19 For men and for women in each age group, those who had never smoked were on average somewhat healthier than the current smokers, but the current smokers were on average much healthier than those who had recently stopped smoking.
(a) Why did they study men and women and the different age groups separately?
(b) The lesson seems to be that you shouldn't start smoking, but once you've started, don't stop. Comment briefly. plo47
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