Thousands of people have been pushed into drug addiction in Afghanistan - the world's largest producer of opium - amid the ongoing economic crisis since the Taliban came to power in August last year.

The crisis, with a shortage of food, employment and liquidity, has prevented the Taliban from keeping their promise of outlawing opium production in the country.

A thick fog smelling of burnt drugs rises from under one of Kabul's bridges, where a crowd gathers daily in the dry riverbed to buy and consume opium.