Panel A, The ability of VEH, 1, and 10 mg/kg THC, 1 and 10 mg/kg CBD, and 5 mg/kg MOR to produce place conditioning effects. Panel B, Effects of various doses of CBD upon a dose of THC (1 mg/kg) incapable of producing CPP or CPA when administered alone. Panel C, Effects of various doses of CBD upon a dose of THC (10 mg/kg) that produces CPA when administered alone. Values represent the mean (±SEM) of 9–12 mice per group and are expressed as the difference between postconditioning and preconditioning time spent in the drug-paired compartment.