The drug like effects experienced by cannabis users are caused by cannabinoids, the active chemicals that are present in the plant. The main active cannabinoid in cannabis is delta-9-tetrahydrocannabinol, more simply known as THC. Cannabinoids may be useful in the treatment of cancer and the side effects of cancer treatment. Possible effects of treatment with cannabinoids include, a decrease in pain and inflammation, blockage of cell growth, the prevention of blood vessel growth that supplies tumors, and anti viral activity. - National Geographic
