Happiness as preventive medicine likely depends on how you define it. If you think of happiness as fleeting and resulting from factors outside of yourself, like a new job or a Hawaiian vacation, well then it's probably not so beneficial. But if you see it as inherently within you -- something you give, rather than get -- then it's a different story. A study led by George Vaillant, HMS professor of psychiatry at Massachusetts General Hospital, is cited.
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