In Nigeria, thousands of young people are addicted to codeine cough syrup – a medicine that’s become a street drug. The Nigerian senate estimates that 3 million bottles of codeine syrup are drunk every day in just two states – Kano and Jigawa. But who makes this syrup? And who sells it to Nigeria’s students? BBC Africa Eye went undercover to investigate. Subscribe to our channel for more investigative journalism. Nothing stays hidden forever.