A Link Between Marijuana, Schizophrenia Is Tenuous

NEW YORK: Samuel T. Wilkinson’s attempt to tie marijuana to mental illness (“Pot-Smoking and the Schizophrenia Connection,” WSJ op-ed, July 2) is reefer madness all over again.

The evidence indicating a causal relationship between marijuana consumption and mental disorders is “neither very new, nor by normal criteria, very compelling,” according to research published in the journal Addiction in 2010.

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