This document provides information on various drugs, their signs of use, and effects. It defines key terms like drugs, drug users, and drug dependence. It then describes various types of drugs like hallucinogens, marijuana, ecstasy, methamphetamine, cocaine, GHB, ketamine, heroin, opium, morphine, inhalants, nicotine, and alcohol. For each drug, it provides street names, signs of use like physical symptoms, and other potential effects. The document also discusses common signs of drug abuse and signs and symptoms of drug abuse at different stages from early to becoming psychotic.