Although a number of cannabinoids have been identified and synthesized, why are we limited to only knowing the percentage of THC and CBD in a strain? History of Cannabinoid Discovery: Cannabinol or CBN , the degraded form of THC, was first identified around the end of the 19th century. The presence and quantity of this cannabinoid in your medicinal cannabis, is an indication of its age. Although mildly psychoactive, it does contain a number of medicinal benefits that contribute to homeostasis in your body. Moving forward to the forties: Roger Adams, the University of Illinois Department Head of Chemistry, identified CBD (Cannabidiol) in 1940 and subsequently, THC in 1942. Despite these discoveries, it wasn't until the early sixties when these cannabinoids were fully understood and able to be synthesized (reproduced in the lab). During this time in the sixties, a number of other cannabinoids were discovered including cannabigerol (CBG), cannabichromene (CBC),T...