The International Day Against Drug Abuse and Illicit Trafficking is a United Nations International Day against drug abuse and the illegal drug trade. It is observed annually since 26 June 1989. The date 26 June is to commemorate Lin Zexu's dismantling of the opium trade in Humen, Guangdong, ending on 25 June 1839, just before the First Opium War in China. The observance was instituted by UN General Assembly Resolution 42/112 of 7 December 1987.