( CNN ) -- By a narrow margin of about 4,300 votes , Arizona voters approved a ballot measure that would legalize medical marijuana , state election officials said Sunday . With all precincts reporting , the `` yes '' votes on Proposition 203 have 50.1 percent of the vote to 49.8 percent of `` no '' votes , according to unofficial results posted on the Arizona Secretary of State 's website . More than 1.6 million votes were cast . Officials in Maricopa County , where the city of Phoenix is located , posted their final update to the unofficial results from the November 2 election on Saturday . At the time , authorities said the race was too close to call . The Marijuana Policy Project , in a statement , heralded the vote , saying it will allow patients who suffer from cancer , AIDS and other illnesses to use medical marijuana with a recommendation from their doctor . `` Voters in Arizona have sided with science and compassion while dealing yet another blow to our nation 's cruel and irrational prohibition on marijuana , '' said Rob Kampia , Marijuana Policy Project executive director , in the statement . `` Arizona 's law now reflects the mainstream public opinion that seriously ill people should not be treated like criminals if marijuana can provide them relief , and that doctors should be able to recommend marijuana to patients if they believe it can help alleviate their suffering . '' The Marijuana Policy Project provided funding and support to the Arizona Medical Marijuana Policy Project , the group that ran the Proposition 203 campaign , the group said . The national organization bills itself as the United States ' largest marijuana policy reform organization , and says on its website it would like to see marijuana regulation similar to that of alcohol . Since 1996 , 14 other states and the District of Columbia have passed medical marijuana laws . The proposition will allow the establishment of about 120 state-regulated clinics to dispense marijuana , according to the organization . Those living more than 25 miles from a clinic will be allowed to grow their own medicine . CNN 's Nick Valencia contributed to this report .
This joins 14 states and the District of Columbia . The Marijuana Policy Project says it welcomes the vote . The bill passed by a narrow margin .