Addiction is a type of brain disorder which results in compulsive engagement of stimuli, even when the subject is aware of its negative consequences. The behavior is triggered if the body does not get the reward. The most common sources of addiction are opium, nicotine, alcohol, sex, food, cocaine, amphetamine, or gambling. The treatment generally includes medication and behavioral therapy. The book aims to shed light on some of the unexplored aspects of addiction. It provides deep insights about the concepts, theories, and treatment of these addictions. This textbook presents the complex subject of addiction in the most comprehensible and easy to understand language. This book, with its detailed analysis and data, will prove immensely beneficial to professionals and students involved in this area.