As the world marks the International Day Against Drug Abuse and Illicit Trafficking next Friday, Consultant Clinical Psychologist and Head of Psychological Services at the Federal Neuro-Psychiatric Hospital, Yaba, Lagos, Dr. Omotayo Ajirotutu, has urged parents, schools and communities to recognise early signs of substance abuse among youths. In this interview with Sunday Ehigiator, he advocates early detection, mental health support and timely intervention. Excerpts: