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Median (n=11) delta-9-tetrahydrocannabinol (THC) (A), 11-hydroxy-THC (11-OH-THC) (B) and 11-nor-9-carboxy-THC (THCCOOH) (C) plasma concentrations during 1st (D1) and 5th (D5) days of 0, 30, 60 and 120 mg/day dronabinol and a single smoked cannabis challenge. Arrows indicate dronabinol administration.
