Addiction focuses on the emergence, nature, and persistence of addictive behaviors, as well as the efforts of addicts to overcome their condition. Do addicts act of their own free will, or are they driven by forces beyond their control? Do structured treatment programs offer more hope for recovery? What causes relapses to occur? Recent scholarship has focused attention on the voluntary aspects of addiction, particularly the role played by choice. Addiction draws upon this new research and the investigations of economists, psychiatrists, philosophers, neuropharmachologists, historians, and sociologists to offer important new insights into the sad puzzle of addictive behavior.