White Paper: Understanding the Biopsychosocial Model of Addiction

Why Biology, Psychology, and Social Environment All Matter in Recovery from Substance and Maladaptive Behavior

A comprehensive, evidence-based exploration of how biological predisposition, psychological experience, and social environment interact to shape both vulnerability and the path toward lasting recovery.

Abstract

For decades, the question of what causes compulsive substance use and maladaptive behavior has driven both scientific inquiry and public debate. Early models placed blame squarely on individual character, framing compulsive behavior as a moral failing. While the disease model that followed represented a significant step forward by legitimizing these conditions as medical concerns, it too offered an incomplete picture. Neither moral judgment nor biology alone can explain why one person develops a compulsive pattern while another, exposed to the same substance or behavior, does not.

The biopsychosocial model, first proposed by George Engel in 1977 and adapted for understanding substance use and maladaptive behavior by Marlatt and Baer in 1988, provides the most comprehensive framework available. It recognizes that a constellation of biological, psychological, and social factors converge to create each individual’s unique relationship with substances and behaviors. More importantly for those in recovery, this model illuminates why healing must address all three dimensions—not just the substance or behavior itself—to build a life that lasts.