The United Nations Office on Drugs and Crime (UNODC) has reported that the opium grown in Afghanistan is the main source for 80% of people who use opiates worldwide. The report also states that 85% of global opium comes from Afghanistan. The UNODC’s executive director has called for international assistance to reduce drug cultivation in the country.

Source:  https://www.unodc.org/unodc/en/frontpage/2021/November/afghan-opiates-supply-8-out-of-10-opiate-users-worldwide--unodc-finds--as-experts-meet-in-vienna-to-combat-illicit-trafficking.html