Afghanistan has long been known as a major producer of drugs - but now it's become one of the worst consumers of illegal drugs in the world. High unemployment, war trauma and easy access to refined heroin have resulted in more than a million Afghans being addicted to drugs. As part of 2013: The Big Stories, another chance to see BBC Persian's reporter Tahir Qadiry travel to Afghanistan to understand the extent of the problem. He follows a young addict as he makes his way through rehabilitation, talks to dealers and outreach workers, and asks ministers what's being done to prevent addiction and the drugs trade from threatening the future stability of Afghanistan.