'The latest UN figures indicate that the output of heroin increased by 61 percent in Afghanistan last year despite the Western claims about their will to curb the production of drugs during the invasion of the war-battered country.

Opium production by Afghan farmers rose between 2001 and 2011 from just 185 tons to a staggering 5,800 tons. Last year, levels increased by 61 percent, with more than 90 percent of heroin found on British streets being traced back to opiates cultivated in Afghanistan, according to UN figures.

The UN figures make grim reading for those who backed the invasion of Afghanistan. Former British Prime Minister Tony Blair said in 2001 that a significant reason for deployment of foreign forces to Afghanistan was to curtail a flourishing heroin trade.'

Read more: Production of Afghan Heroin Jumps by 61%: UN