Afghanistan’s opium poppy harvest produces more than 90% of illicit heroin globally, and more than 95% of the European supply.
Another obstacle to getting rid of poppy cultivation in Afghanistan is the reluctant collaboration between US forces and Afghan warlords in hunting drug traffickers. In the absence of the Taliban, the warlords largely control the opium trade but are also highly useful to US forces in scouting, providing local intelligence, keeping their own territories clean from Al-Qaeda and Taliban insurgents, and even taking part in military operations.
https://en.wikipedia.org/wiki/Opium_production_in_Afghanistan
origin - https://www.pipiscrew.com/2019/08/opium-production-in-afghanistan/ opium-production-in-afghanistan