Drugs have been used by many cultures in history. In Cuba and parts of South America, people would chew coca leaves, which is where cocaine comes from, while they worked. Chewing the leaves would allow men to work longer and with more vigor, but workers would be gray by the time they turned 30. Some villagers still do this today. It is a question of accelerating the way the brain works.
I recall watching a documentary about some hunters in the Amazon jungle who would extract secretion from a frog and spread it over a small wound they would make. The practice allowed them to run faster and longer.
I believe the narcotic was the key to this state of mind, but it's quite possible that it may have been a brew, which they mixed series of plant or animal substance to produce. Having lived in the east for several years, I've seen Chinese medicine that can accomplish unbelievable things, such as abortions. It's all a question of knowing the combination of roots, leaves and ingredients. Some of these medicines can be very beneficial, but they can also be used in improper ways.
Therefore, if you ever travel or come across something you're not entirely familiar with, DO NOT DRINK IT! I have seen potions that can put people out, after which they are robbed and/or ....., and I have seen potions that can make people halucinate and do things they regret.