20
Medical marijuana is now legal in 20 states and the District of Columbia. Of those states, Washington and Colorado have legalized marijuana for recreational use. Colorado's first retail marijuana stores opened Jan. 1 for sale to people 21 years and older. Under federal law, marijuana is still an illegal drug. Twenty-three states and the District of Columbia currently have laws legalizing marijuana in some form. Four states and the District of Columbia have legalized marijuana for recreational use. In Alaska, adults 21 and older can now transport, buy or possess up to an ounce of marijuana and six plants. Medical use of hemp has legalized in17 of 50 US States and DC. California, Alaska, Washington, Oregon, Maine, Nevada, Hawaii, Colorado, Vermont, Montana, Rhode Island, New Mexico, Michigan, DC, New Jersey, Arizona, Delaware, Connecticut are the 17 States and DC that have legalized weed. http://www.herbalmission .... Medical use of marijuana has legalized  in18 of 50 US States and DC. California, Alaska, Washington,  Oregon, Maine, Nevada, Hawaii, Colorado, Vermont, Montana, Rhode  Island, New Mexico, Michigan, DC, New Jersey, Arizona, Delaware,  Connecticut are the 18 States and DC that have legalized  marijuana. There are 23 states with at least medical marijuana legalized. Denver became the first city in the nation to make the private use of marijuana legal for adults 21 and older. There are currently two states that allow for the recreational use of marijuana: Colorado and Washington. Colorado and Washington State legalized marijuana in 2012. If all goes well, Oregon, Alaska, and Washington D.C. will also legalize marijuana in 2014. Medical use of hemp has legalized in17 of 50 US States and DC. California, Alaska, Washington, Oregon, Maine, Nevada, Hawaii, Colorado, Vermont, Montana, Rhode Island, New Mexico, Michigan, DC, New Jersey, Arizona, Delaware, Connecticut are the 17 States and DC that have legalized weed. In four states, Alaska, Colorado, Oregon and Washington, the sale and possession of marijuana is legal for both medical and non-medical use; and Washington DC has legalized personal use but not commercial sale.
http://www.usatoday.com/story/news/nation-now/2014/01/06/marijuana-legal-states-medical-recreational/4343199/ http://www.governing.com/gov-data/safety-justice/state-marijuana-laws-map-medical-recreational.html http://www.answers.com/Q/How_many_states_have_legalized_medical_marijuana http://www.answers.com/Q/How_many_states_legalized_marijuana http://www.answers.com/Q/How_many_states_legalized_marijuana http://www.theweedblog.com/which-states-will-legalize-marijuana-in-2016/ http://www.answers.com/Q/How_many_states_legalized_marijuana https://en.wikipedia.org/wiki/Cannabis_in_the_United_States
how many states have legalized marijuana