Caffeine is one of the world's most widely used drugs. Some anthropologists believe its use may date back to the Stone Age. Caffeine was first extracted from coffee in 1821. Coffee originated in Ethiopia, by the fourth century AD it was introduced to Arabia and the rest of the east. It is believed that the Ethiopian nomads discovered coffee through their animals. They realized that after the animals would eat the fruits from the trees they would have an energy boost, so the nomads tried eating the seeds too and they also had an increase in energy. Coffee has since been used in religious ceremonies so that the people involved in the rituals could stay up and pray the entire night. in 1573 coffee was introduced to the Europeans, when it was first introduced them, the authorities tried to ban it but they couldn't do it. Tea was introduced later in 1657 and became very popular to the people. Even later milk chocolate was introduced into Switzerland in 1876, near the end of the 19th century cola products started to appear around the world.