The revised fourth edition of Substance Use and Misuse retains its comprehensive, holistic examination of the field of addiction from a Canadian perspective. Organized into seven sections, the 33 chapters examine the nature of addiction; explore biological, psychological, and social theories that attempt to explain addiction; discuss drugs that produce addiction, along with a review of prevention, treatment, and treatment system options; and consider the legal and ethical issues that those working in substance use and addiction frequently encounter. Thoroughly updated to reflect contemporary issues, policy changes, and recent advances in the field of addiction counselling, Rick Csiernik's much-loved text features three newly added chapters on the topics of cannabis, the "Triple S" prevention approach for schools and communities, and relapse prevention. New and expanded content covers areas such as vaping, the toxic drug crisis, prevention, decriminalization versus legalization, and resources for Indigenous communities. Substance Use and Misuse, Fourth Edition is an essential and timely resource for courses across social work, human services counselling, psychology, and mental health and addiction programs, as well as for counsellors treating individuals faced with addiction.