Substance use disorders, commonly referred to as addictions, are very common. In 2023, nearly 17 percent of Americans aged 12 and up dealt with some kind of substance use disorder. The forthright yet compassionate main text, enhanced with detailed charts and thoroughly researched fact boxes, explores the causes of substance use disorders, their impact on mental and physical health, and the tools needed to make positive, lasting changes. Teens are empowered to recognize unhealthy patterns, understand the science of addiction, and seek or offer support.