he third most common cannabinoid is CBN, which is more or less a byproduct of the chemical breakdown of THC. CBN lacks the strong psychoactive and medicinal qualities of THC and is usually found in degraded or poorly-preserved marijuana.
Although cannabinoids get all the press, marijuana does contain over 100 terpenoids (wiki) which are aromatic chemicals that can also be found in pine trees, citrus flora, and other odoriferous plants. Terpenoids produce the unique aroma and flavor of marijuana, but many researchers believe that terpenoids might have significant medicinal effects. In comparison to the cannabinoids, little is really known about terpenoids in cannabis.