Substance dependence poses a significant burden not only for the affected individual but also for their close social environment: relatives are intensely exposed to the consequences of addictive behavior. This book focuses on the affected groups - partners, children, parents, friends, and colleagues of individuals with addiction - and illustrates their various burdens and support needs based on research findings and case studies. The authors discuss foundational concepts and theoretical models on the topic, such as the controversial concept of codependency, and present proven as well as innovative support options and treatment approaches for the relatives of individuals with addiction.