This document discusses the short-term and long-term effects of substance use and abuse. It covers six classifications of drugs: gateway drugs, depressants, stimulants, narcotics, hallucinogens, and inhalants. For each classification, it provides examples of short-term effects such as euphoria, slurred speech, and nausea as well as serious long-term health effects including cancer, heart disease, and brain damage. The document also discusses how substance abuse affects families, schools, and communities through financial issues, poor academic performance, and increased crime rates.