The human endocannabinoid system, the system of receptors that bind with and process cannabinoids introduced into the body, is complex. Only in the early 90s did researchers discover the cannabinoid receptors in the brain and the research since then has not been robust. Until now.
Marijuana prohibition has limited the potential medical development of the plant and its compounds but that is all changing. As more states are relaxing marijuana prohibition the federal government is relaxing possession rules