There are two things to remember as you're reading: Most of the research done involving the cannabis plant or its individual psychoactive compounds administered in carefully measured doses—a far out-burst from the variability in strains being sold on the street or even in dispensary shops. "That's the equal of buying penicillin at a flea market," said Ivor Grant, MD, head of the department of psychiatry at the University of California San Diego School of Medicine.

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