Cannabidiol (CBD) is a cannabinoid found in Cannabis. It is a major constituent of the plant, representing up to 40% in its extracts. It is the product of Cannabidiolic Acid (CBD-A) which convert to CBD when burned, vaporized, or exposed to certain teperatures for c'ertain tim'e p'eriods. It has displayed sedative effects in animal tests. Some research, however, indicates that CBD can increase alertness. It may decrease the rate of THC clearance from the body, perhaps by interfering with the metabolism of THC in the liver.