“Marijuana has been reported to suppress nausea produced by chemotherapy treatment in human cancer patients.
… there is abundant evidence that cannabinoid agonists attenuate vomiting in emetic species…
The present experiments evaluated the potential of low doses of the cannabinoid agonists, delta-9-tetrahydrocannabinol (THC; 0.5 mg/kg, i.p.), and HU-210 (0.001 mg/kg and 0.01 mg/kg, i.p.), and the CB(1) antagonist SR-141716A in modulating the establishment and the expression of lithium-induced conditioned rejection reactions in rats.
These results indicate that the establishment and the expression of lithium-induced conditioned rejection reactions are suppressed by pretreatment with cannabinoid agents.”