John Halpern and Mclean Hospital Free People Check 

( I'm John Halpern)
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Google News: Pot smoking, other drug use not tied to middle-age mental decline

[Reuters AlertNet] - "In a Western population of occasional drug users, this is what you'd expect to see," said John Halpern, a psychiatrist at Harvard Medical School and McLean Hospital in Belmont, Massachusetts, who has studied the potential cognitive effects of drug use
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