Coca is traditionally cultivated in the lower altitudes of the eastern slopes of the Andes. Since time immemorial, its leaves have been used as a stimulant by the indigenous people of Peru, Bolivia, and northern Argentina; it also has religious and symbolic significance. Since the 1980s, the cultivation of coca has become controversial because it is used for the manufacture of the drug cocaine, which is illegal in most countries.
Good samples of the dried leaves are uncurled, are of a deep green on the upper, and a grey-green on the lower surface, and have a strong tea-like odor; when chewed they produce a faint numbness in the mouth, and have a pleasant, pungent taste. Bad specimens have a camphoraceous smell and a brownish colour, and lack the pungent taste.
The Coca-Cola Company buys 115 tons of coca leaf from Peru and 105 tons from Bolivia per year, which it uses as an ingredient in its Coca-Cola formula (famously a trade secret). The cocaine itself does not end up in the drink nowadays, however, and is generally sold to the pharmaceutical industry where it is used for various surgical procedures.
Coca eradication is a strategy strongly promoted by the U.S. government as part of its "War on Drugs" to eliminate the cultivation of coca, a plant whose leaves are used in the manufacture of cocaine. This strategy is being pursued in the coca-growing regions of Colombia, Peru, and Bolivia, where it is highly controversial because of its environmental and its socioeconomic impact.
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Coca was also a vital part of the religious cosmology of the Andean tribes in the pre-Inca period as well as throughout the Inca Empire (Tahuantinsuyu). Coca was historically employed as an offering to the Sun, or to produce smoke at the great sacrifices; and the priests, it was believed, must chew it during the performance of religious ceremonies, otherwise the gods would not be propitiated. Coca is still held in veneration among the indigenous and mestizo peoples of Peru, Bolivia, Ecuador, Colombia and northern Argentina and Chile.
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Coca is traditionally cultivated in the lower altitudes of the eastern slopes of the Andes. Since time immemorial, its leaves have been used as a stimulant by the indigenous people of Peru, Bolivia, and northern Argentina; it also has religious and symbolic significance. Since the 1980s, the cultivation of coca has become controversial because it is used for the manufacture of the drug cocaine, which is illegal in most countries.
Coca was also a vital part of the religious cosmology of the Andean tribes in the pre-Inca period as well as throughout the Inca Empire (Tahuantinsuyu). Coca was historically employed as an offering to the Sun, or to produce smoke at the great sacrifices; and the priests, it was believed, must chew it during the performance of religious ceremonies, otherwise the gods would not be propitiated. Coca is still held in veneration among the indigenous and mestizo peoples of Peru, Bolivia, Ecuador, Colombia and northern Argentina and Chile. 
