Cannabis is a genus of flowering plants that includes three putative species; Cannabis sativa; Cannabis indica; and Cannabis ruderalis. These three taxa are indigenous to Central Asia; and South Asia.

Cannabis has long been used for fibre (hemp); for seed and seed oils; for medicinal purposes; and as a recreational drug. Industrial hemp products are made from Cannabis plants selected to produce an abundance of fibre. To satisfy the UN Narcotics Convention; some hemp strains have been developed which contain minimal levels of THC (?9- tetrahydrocannabinol); one of the psychoactive molecules that produces the "high" associated with marijuana.

The psychoactive product consists of dried flowers of plants selectively bred to produce high levels of THC and other psychoactive chemicals. Various extracts including hashish and hash oil are also produced from the plant.