This document provides an introduction to a class on drugs and society. It begins with polling students to gauge their expectations and reasons for taking the class. It then outlines class policies, assignments, and expectations. The document discusses key concepts around drug use including what constitutes a drug, commonly abused drugs, and factors that influence drug use. Statistics on drug use in the United States are presented, showing high rates of alcohol, tobacco, and marijuana use. Four types of drug use and dimensions of drug abuse are defined.