Cannabis: What Teenagers Need to Know. Britain has the highest proportion of young cannabis smokers of any European country - 38 per cent have tried the drug by the age of 16. Until recently, little was known about how cannabis affects developing brains, so reporter Justin Rowlatt gets to grips with the latest research to explore growing evidence of links between the drug and psychotic illness in young people.
Producer Angeli Mehta ; Editor Mike Robinson Signed repeat on Thursday at 1.55am [Web Address Removed] NOTE: as Panorama reacts to news, its subject matter may change