Cocaine (benzoylmethylecgonine) is a crystalline tropane alkaloid that is obtained from the leaves of the coca plant.[5] The name comes from "coca" in addition to the alkaloid suffix -ine, forming cocaine. It is a stimulant of the central nervous system and an appetite suppressant. Specifically, it is a serotonin-norepinephrine-dopamine reuptake inhibitor, which
mediates functionality of such[clarification needed] as an exogenous catecholamine transporter ligand. Because of the way it affects the mesolimbic reward pathway, cocaine is addictive.[6]
Its possession, cultivation, and distribution are illegal for non-medicinal and non-government sanctioned purposes in virtually all parts of the world. Although its free commercialization is illegal and has been severely penalized in virtually all countries, its use worldwide remains widespread in many social, cultural, and personal settings.
Coca leaf
Coca leaf in Bolivia
For over a thousand years South American indigenous peoples have chewed the coca leaf (Erythroxylon coca), a plant that contains vital nutrients as well as numerous alkaloids, including cocaine. The leaf was, and is, chewed almost universally by some indigenous communities?ancient Peruvian mummies have been found with the remains of coca leaves and pottery from the
time period depicts humans, cheeks bulged with the presence of something on which they are chewing.[7] There is also evidence that these cultures used a mixture of coca leaves and saliva as an anesthetic for the performance of trepanation.[8]
When the Spanish arrived in South America, most at first ignored aboriginal claims that the leaf gave them strength and energy, and declared the practice of chewing it the work of the Devil. But after discovering that these claims were true, they legalized and taxed the leaf, taking 10% off the value of each crop.[9] In 1569, Nicolás Monardes described the practice
of the natives of chewing a mixture of tobacco and coca leaves to induce "great contentment":
? [...when they wished to] make themselves drunk and [...] out of judgment [they chewed a mixture of tobacco and coca leaves which ...] make them go as they were out of their wittes [...][10] ?
In 1609, Padre Blas Valera wrote:
? Coca protects the body from many ailments, and our doctors use it in powdered form to reduce the swelling of wounds, to strengthen broken bones, to expel cold from the body or prevent it from entering, and to cure rotten wounds or sores that are full of maggots. And if it does so much for outward ailments, will not its singular virtue have even greater effect in the
entrails of those who eat it?
source: en.wikipedia.org/wiki/Cocaine Edit 
