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The collective name given to the terpenes found in Cannabis is cannabinoids. Most of the naturally occurring cannabinoids have now been identified, and three are the most abundant—cannabidiol (CBD), tetrahydrocannabinol (THC), and cannabinol (CBN). The steps from CBD to THC to CBN represent the biosynthetic pathway in the plant. THC is an optically active resinous material that is very lipid-soluble but water-insoluble; these physical properties make pharmacological investigations difficult, since various nonpolar solvents must be used. Although many other materials have been found in this plant, the cannabinoids are unique to it and THC is the only one with appreciable mental affects. THC is believed to be largely, if not solely, responsible for the effects desired by those who use Cannabis socially. Virtually all the effects pro-Biosynthetic Pathway of Cannabinoids duced by smoking or eating some of the whole plant can be attained by using THC alone.