USA. Washington state. Seattle. The Green Cross flag is the symbol of a Medical Marijuana Dispensary. An open sign on the dispensary's door which is authorized, according to cannabis legalization in Washington State, to sell marijuana as a retail medical store front. Cannabis, commonly known as marijuana, is a preparation of the Cannabis plant intended for use as a psychoactive drug and as medicine. Pharmacologically, the principal psychoactive constituent of cannabis is tetrahydrocannabinol (THC); it is one of 483 known compounds in the plant, including at least 84 other cannabinoids, such as cannabidiol (CBD), cannabinol (CBN), tetrahydrocannabivarin (THCV), and cannabigerol (CBG). 13.12.2014 © 2014 Didier Ruef