Opium poppy cultivation in Afghanistan reached a record high in 2014, a United Nations report revealed on Wednesday, highlighting the failure of the multi-billion dollar US-led campaign to crack down on the lucrative crop. The total area under cultivation was about 224,000 hectares in 2014, a seven per cent increase on last year, according to the Afghanistan Opium Survey released by the United Nations Office on Drugs and Crime (UNODC).