Summary: Professor Dan Lubman talks about cannabis use; the complex pharmalogy that underlies its the physical and psychosocial effects; and the links between cannabis and psychosis and affective disorders. He discusses the importance of adopting a a non judgemental approach to engage the patient, assess substance abuse and psychological comorbidity and minimise harm from cannabis use. Motivational interviewing techniques can assist the patient in making links between their cannabis use and mood and psychosocial difficulties
