Why have humans evolved tendencies for substance addiction? In this episode, Adam and Tom discuss the evolutionary explanations for these vulnerabilities. The discussion is based on their paper "Evolutionary perspectives on substance and behavioural addictions: Distinct and shared pathways to understanding, prediction and prevention". Dr Tom Carpenter is a resident doctor in Psychiatry based in NHS Greater Glasgow & Clyde and an Honorary Clinical Lecturer at the University of Glasgow. He is also a member of the executive committee of the Evolutionary Psychiatry Special Interest Group of the Royal College of Psychiatrists. He studied medicine at the University of Edinburgh after initially studying Human Sciences at the University of Oxford, completing a Master’s degree in research in Animal Behaviour at Newcastle University, and having a brief career in marketing. He has worked in a specialist addictions service in Glasgow and currently works in an early intervention in psychosis service. He has current research and engagement projects around the usefulness and impact of evolutionary psychoeducation for mental health clinicians.