The chemical compounds found in cannabis are called cannabinoids. Tetrahydrocannabinol, or THC, is the main psychoactive compound in cannabis. Cannabidiol, or CBD, is another major constituent of the plant. Cannabis comprises roughly 113 different cannabinoids, each possessing varied properties. THC is known primarily for its psychoactive euphoric effect, while CBD is a known analgesic and anti-inflammatory affecting the immune system. In addition to cannabinoids, cannabis contains other chemicals such as terpenes and flavonoids.