Sometimes it seems that the sports pages are filled with the stories of superstar athletes who use performance-enhancing drugs. But in fact, most users of these substances are just regular folks trying to improve their workouts or lift more weights at the gym. Unfortunately, these drugs are serious business and can be extremely dangerous. This book looks at the types of performance-enhancing drugs that exist and the problems that follow their use and abuse. From caffeine and aspirin to heroin and meth, drugs are an inescapable part of life in the 21st century. Addiction, once viewed as a shameful secret, is now widely understood to be a brain disease that can be treated. This series explores the many facets of this complex topic, providing students with the facts they need to navigate drug use and abuse in their daily lives.