The Incas revered the coca plant as being sacred or magical. Its leaves were used in moderate amounts to lessen hunger and pain during work, but were mostly used for religious and health purposes. When the Spaniards realized the effects of chewing the coca leaves, they took advantage of it. They forced the people of the Tawantinsuyo (Peru) to become addicted to it to avoid having to provide the usual amounts food and rest while they were engaged in slave labour. The Chasqui (messengers) chewed coca leaves for extra energy to carry on their tasks as runners delivering messages throughout the empire. The coca leaf was also used during surgeries as an anaesthetic.