Cannabinoids are a class of chemical compounds which include the phytocannabinoids, and chemical compounds which mimic the actions of phytocannabinoids or have a similar structure (e.g. endoccanabinoids, found in the nervous and immune systems of animals and that activate cannabinoid receptors). Among a long list of other benefits, cannabinoids exert palliative effects in cancer patients by preventing nausea, vomiting and pain and by stimulating appetite. In addition, these compounds have been shown to inhibit the growth of tumour cells in culture and animal models by modulating key cell-signalling pathways. A better understanding of the cannabinoids can help you understand which medicine works best for you. Cannabidiol (CBD) With respect to the medical potential of the cannabis, CBD may hold the most promise for many serious conditions. CBD is a non-psychoactive cannabinoid that is believed to reduce the psychoactive effects of THC. Smokers of cannabis with a higher CBD/THC ratio are less likely to experience anxiety. CBD may also inhibit cancer cell growth. Tetrahydrocannabinol (THC) The most abundant and widely known cannabinoid in marijuana, THC is the cannabinoid responsible for the main psychoactive effects patients are familiar with. The compound is a mild analgesic and cellular research has shown the compound has antioxidant activity. THC is believed to interact with parts of the brain normally controlled by the endogenous cannabinoid neurotransmitter anandamide. Cannabinol (CBN) A psychoactive cannabinoid that comes about from the degradation of THC, there is usually very little CBN in a fresh plant. CBN potentiates the effects of THC. The degradation of THC, into CBN, is often described as creating a "couch lock" effect. Cannabigerol (CBG) A nonpsychoactive cannabinoid, CBG has antibacterial effects and can alter the overall effects of Cannabis. Tetrahydrocannabivarin (THCV) THCV is found in largest quantities in Cannabis sativa strains. It is currently being developed as a treatment for metabollic disorders including diabetes. THCV has been shown to block the psychoactive effects of THC. Cannabichromene (CBC) More common in tropical cannabis varieties. Effects include anti-inflamatory and analgesic.