The Public Health Service studied the effects of smoking on health,in a large sa

Question

The Public Health Service studied the effects of smoking on health,in a large sample of representative households. For men andfor women in each age group, those who had never smoked were onaverage somewhat healthier than the current smokers, but thecurrent smokers were on average much healthier than those who hadrecently stopped smoking.

a) Why did they study men and women and the different age groupsseparately?

b) The lesson seems to be that you shouldn't start smoking, butonce you've started, don;t stop. Comment briefly.

Explanation / Answer

Because the bodies of men differ in some ways fom the bodiesof women. These difference can have an effect on the result of thetest. Therefore they made two groups
b)
People who have never smoked are the healthiest, so you shouldmake sure you belong to that group. Therefore you shouldn'tsmoke.
From the other groups the ones who didn't quit are thehealthiest. So if you smoke, you should make sure you belong to thegroup which didn't quit smoking.

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