This document discusses the historical use of intoxicating substances by humans. It describes how hallucinogens, inebriants, hypnotics, and stimulants have been used for religious ceremonies, medicine, and recreation since prehistoric times. Specific examples discussed include the use of opium in ancient Sumeria and Egypt and its derivatives like morphine and heroin. Coca leaves were used for thousands of years by indigenous South Americans and later cocaine was extracted from them, being used medically before becoming a recreational drug. Tea and coffee are described as mild stimulants. The document focuses on the historical use and evolution of opium, cocaine, and their cultural impacts.