I read an interview with Michael Bloomberg where he brags about increasing the longevity of New Yorkers. I don't have the exact quote, but it was a self-promoting piece implying that his anti-smoking laws and green spaces improved the health of New Yorkers.
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What improved the health of New Yorkers was throwing out the poor and making this a city for rich people. Rich people live longer than poor people... by a lot. These statistics (from The Nation about Baltimore) show just how much.