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One widely applied criterion for species recognition is that species are "groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups." It remains controversial whether sufficient morphological and genetic divergence occurs within the genus as a result of geographical or ecological isolation to justify recognition of more than one species. However, if a large amount is taken orally the effects may last much longer.Cannabis sativa appears naturally in many tropical and humid parts of the world. After 24 hours to a few days, minuscule psychoactive effects may be felt, depending on dosage, frequency and tolerance to the drug.

Three species may be recognized: Cannabis sativa, Cannabis indica, and Cannabis ruderalis; C. sativa; or all three may be treated as subspecies of a single species, C. Cannabis has long been used for hemp fibre, for hemp oils, for medicinal purposes, and as a recreational drug.Industrial hemp products are made from cannabis plants selected to produce an abundance of fiber.Linnaeus was familiar with European hemp, which was widely cultivated at the time. Additional Cannabis species were proposed in the 19th century, including strains from China and Vietnam (Indo-China) assigned the names Cannabis chinensis Delile, and Cannabis gigantea Delile ex Vilmorin. ruderalis Janisch, and Cannabis ruderalis Janisch, as alternative names. kafiristanica Vav., and ruderal populations in Europe to C. However, hemp can refer to any industrial or foodstuff product that is not intended for use as a drug.In 1785, noted evolutionary biologist Jean-Baptiste de Lamarck published a description of a second species of Cannabis, which he named Cannabis indica Lam. However, many taxonomists found these putative species difficult to distinguish. In 1929, renowned plant explorer Nikolai Vavilov assigned wild or feral populations of Cannabis in Afghanistan to C. Many countries regulate limits for psychoactive compound (THC) concentrations in products labeled as hemp.When plants of these two chemotypes cross-pollinate, the plants in the first filial (F Whether the drug and non-drug, cultivated and wild types of Cannabis constitute a single, highly variable species, or the genus is polytypic with more than one species, has been a subject of debate for well over two centuries. Finally, the tertiary psychoactive effects of the drug cannabis, can include an increase in heart rate and hunger, believed to be caused by 11-OH-THC, a psychoactive metabolite of THC produced in the liver.

This is a contentious issue because there is no universally accepted definition of a species. Normal cognition is restored after approximately three hours for larger doses via a smoking pipe, bong or vaporizer.

) is a genus of flowering plant in the family Cannabaceae.

The number of species within the genus is disputed.

He is thought to have belonged to the Jushi culture recorded in the area centuries later in the Hanshu, Chap 96B.

Near the head and foot of the shaman was a large leather basket and wooden bowl filled with 789g of cannabis, superbly preserved by climatic and burial conditions.

Cannabis plants produce a unique family of terpeno-phenolic compounds called cannabinoids, some of which produce the "high" which may be experienced from consuming marijuana. Primary psychoactive effects include a state of relaxation, and to a lesser degree, euphoria from its main psychoactive compound, tetrahydrocannabinol.