Understanding addiction has never been more important, as many professionals, from counsellors and nurses, to social workers and health psychologists, encounter addictive behaviour on a daily basis. Looking at addiction in all of its forms, this multi-disciplinary book provides a comprehensive introduction to the substances and the activities which can lead to excessive and addictive behaviour. It discusses pharmacological addictions, including both legal and illegal substances. It also covers nonpharmacological dependencies (such as internet addiction, eating disorders, gambling and sexual addiction) which, despite their prevalence, are often absent from the literature on addiction. Drawing on the field's broad evidence base, the book features: a- coverage of eleven types of addictive substances and activities, outlining signs, symptoms, adverse consequences and assessment and intervention strategies for each; a- a range of engaging reflective activities and case studies to link theoretical discussion directly to practice; a- analysis of the broader context of addiction, including dual diagnosis and harm reduction, and issues relating to diversity and service provision.Offering a rigorous introduction to the full spectrum of addictive behaviour, this book is essential reading for anyone seeking to understand the nature of addiction for contemporary practice.