This document discusses addictive behavior and characteristics of addiction such as reinforcement, compulsion or craving, and loss of control. It describes drug abuse and dependence according to the APA, noting that dependence involves tolerance, withdrawal symptoms, continually taking larger amounts of drugs, and inability to cut down on use despite problems. The document also lists risk factors for drug dependence including psychological, social, and genetic factors. It provides information on commonly abused drugs like opioids, depressants, stimulants, marijuana, hallucinogens, and inhalants and their effects and risks of abuse. Prevention and treatment methods are also summarized.