A former counter-narcotics adviser has told ITV News that if Afghanistan's opium trade was a legitimate company it would be the biggest in the world.
Abbie Aryan, a British Afghan who worked in Kabul on tackling the problem, says it is worth $65bn (£40bn), more than Walmart or Microsoft.
And he said the amount of money it generates in such a poor country was why it was so difficult to stop.
Today the UN warned that opium production is at a record high in Afghanistan.
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