As probably the biggest medical discovery , ~The endocannabinoid system is still a very new discovery in the time line of cannabis discoveries, In the 1960’s Dr Raphael Mechoulam  isolated the compound known as Tetrahydrocannabinol , since then the discoveries are streaming in! Fast forward to 1992 and scientists discover the biggest cannabis discovery , Our bodies are designed with cannabis receptors though out your whole body , namely CB1 and CB2 receptors, Not only that but have also discovered that your body produces on small levels 2 compounds namely Anandamide and 2AG which are called ENDO cannabinoids , the cannabinoids from plants are called Phyto cannabinoids.

this article time stamps the discoveries and gives some extemely interesting insight into this amazing plant and how it interacts within your body

https://www.projectcbd.org/science/endocannabinoid-discovery-timeline