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If poor people live as long as rich people, then longevity is unaffected by wealth. Either the less affluent have stopped smoking or it is not the case that longevity is unaffected by wealth. It is not the case that the less affluent have stopped smoking. Therefore, poor people do not live as long as rich people. (P = Poor people live as long as rich people, L = Longevity is unaffected by wealth, S = Less affluent people have Stopped smoking)