Introduction: the present state of legal marijuana in the USA and the world As of July, 2018 there are 31 states in the USA plus the District of Columbia, Guam, and Puerto Rico that have legal marijuana (cannabis sativa) at least for medical reasons. [1] Nine of these states plus the District of Columbia also permit recreational marijuana. [2] Another fifteen states allow for limited use of products derived from cannabis or synthetic versions of these derivatives. [3] Only four... Read more