"It's more expensive than heroin, and young people see it almost as a luxury drug it's become a chic thing to do." But rich kids use it too – I either deliver it to their houses, or they turn up in their flash cars," he says. Most of my customers are regular kids like me, students, or they've got office jobs. He has been caught countless times by the police but has always paid his way out of prison. Peyvand sells a gram for the equivalent of about $5. In a graffiti-daubed side street in the centre of Tehran, a teenager with an emo haircut and a leather jacket pulled over a grey hoodie stands in a doorway, his pockets stuffed with small plastic bags of crystal meth. But when crystal meth hit the streets it managed to transcend social divides, and could be found everywhere in the city. In seedy corners of south Tehran, addicts gather to inject heroin, as they always have done. Cocaine has become a regular feature at parties among Tehran's richer residents young people throughout the city smoke marijuana and pop ecstasy pills opium – viewed as an older person's drug – is still widely considered to be culturally acceptable. The peak time is 2am and all are catered for. Dealers trade on a layby with lookouts and security dotted around them. At one popular spot north of the city, queues of cars pull up to be served under a motorway flyover. The country's drug problem is not new Iran has one of the highest rates of addiction in the world and the interior minister, Abdolreza Rahmani Fazli, announced recently that some six million Iranians are affected by problems related to drug addiction.