Cannabinol is a non-psychoactive and crystalline cannabinoid found in the Cannabis sativa plant. CBN starts to form when THC degrades due to light, air, or heat exposure. CBN can also form through the degradation and oxidation of the delta-9 THC. In the 1940s, it was isolated from cannabis and is the first cannabinoid to undergo it. Its final chemical and structural synthesis were accomplished by 1940. CBN is more prevalent in dry and aged cannabis. This means they have low concentrations of cured and fresh cannabis, making them more commonplace in cannabis exposed to oxygen and even older cannabis.