Most cannabis products come from or can be made using the flowers and leaves of the cannabis plant. Depending on how they are made, these products can have a range of potencies of THC (and CBD). Table 1 lists the main forms of cannabis and typical potencies of THC.

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Generally, there is no difference between marijuana and cannabis and the two terms are often used to describe the same thing. Cannabis describes cannabis products in general. Marijuana specifically refers to cannabis products that are made from the dried flowers, leaves, stems and seeds of the cannabis plant. How much THC does marijuana contain? Compared to other forms of cannabis, such as hash and hash oil, marijuana usually contains the least concentration of THC. The average potency (concentration or strength) of THC in dried cannabis is between 15% to 30%.

Cannabis, (genus Cannabis), genus of medicinal, recreational, and fibre plants belonging to the family Cannabaceae. By some classifications, the genus Cannabis comprises a single species, hemp (Cannabis sativa), a stout, aromatic, erect annual herb that originated in Central Asia and is now cultivated worldwide. A tall canelike variety is raised for the production of hemp fibre, while the female plants of a short branchier variety are prized as the more abundant source of the psychoactive substance tetrahydrocannabinol (THC), the active ingredient of marijuana. See also medical cannabis.

Morphological differences in wild and cultivated forms of cannabis have introduced taxonomic uncertainties. Hence, in addition to C. sativa, some scientists consider the genus as including a second species, C. indica, and even a third, C. ruderalis. These two species are also sometimes treated as subspecies of C. sativa.