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 on 26 June, since 1989, a date chosen to commemorate Lin Zexu's dismantling of the opium trade in Humen, Guangdong, just before the First Opium War in China.[citation needed] The observance was instituted by General Assembly Resolution 42/112 of 7 December 1987. It is often referred to by Anti-Drug campaigners as 6/26. A play on Marijuana smokers "4/20" day to celebrate cannabis.