1. The chapter discusses various drugs and their effects on the central nervous system, as well as patterns of drug and alcohol use and associated risks. It covers topics like addiction, dependence, abuse, and the physiological impacts of substances like stimulants, depressants, and alcohol. 2. Risks of drug and alcohol use discussed include health problems, accidents, crime, family and social issues, and fetal alcohol syndrome. The chapter provides information to help people make responsible decisions about substance use. 3. Treatment and intervention options for addiction and abuse are also reviewed, along with strategies for responsible alcohol consumption and avoiding high-risk situations involving drugs.