Some young people are taking huge risks in order to survive and prosper at a university in the UK. Harry sells drugs to fellow students, sometimes doing 20 deals each evening. It’s estimated that 1.1 million people aged 16–24 took illegal drugs last year, and Harry admits he's capitalising on a captive market. But how did he get started dealing, and what are the dangers involved? Harry explains the extreme lengths he goes to protect himself, and the difficulties he now faces in trying to quit.