This document discusses substance abuse from a structural-functionalist perspective. It defines substance abuse and dependency, and lists some common causes like genetic predisposition and peer pressure. It outlines the stages of substance abuse from experimental to dependence. Physical, behavioral, and psychological warning signs are provided. Potential complications are discussed along with prevention, treatment, and how substance abuse affects society through increased crime and unemployment rates. Solutions proposed include intervening with media portrayals of drugs, increasing awareness of risks of drug use, and providing early treatment programs.