What Are Delta-9 THC and THCA? Delta-9 THC, or delta-9-tetrahydrocannabinol, is the primary psychoactive compound found in the cannabis plant, responsible for the characteristic “high” associated with marijuana use. Chemically, Delta-9 THC is derived from cannabigerolic acid (CBGA) through a process of decarboxylation, which occurs when cannabis is heated or […]