THC, also known as tetrahydrocannabinol, is a psychoactive compound found in cannabis plants. It’s the primary cannabinoid responsible for the “high” or euphoric sensation that people experience when using cannabis. THC interacts with cannabinoid receptors in the brain and central nervous system, particularly the CB1 receptors, to produce its psychoactive effects. In addition to its psychoactive properties, THC also has potential therapeutic effects, such as occasional pain relief and mood enhancement. Forms of THC include: Delta-8 THC, Delta-9 THC and THCA.