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The plasma concentrations of delta-9-tetrahydrocannabinol (THC) and its active metabolite, 11 hydroxy (OH)-THC. Blood was sampled for plasma concentrations about 3.5 hours after THC was given. There were no significant differences (2-tailed paired t test, P > 0.05). Error bars represent SEM. Black and clear bars represent capsaicin and control sessions respectively. n.s., nonsignificant.
