Nearly two weeks after votes were cast, a measure to legalize medical marijuana has passed in Arizona by the width of a cigarette paper. Despite widespread opposition in the state, Proposition 203, as it is known, cleared by just 4,341 votes out of some 1.67 million that were counted. With the result, Arizona became the 15th state to allow the use of medical marijuana, 14 years after California led the way. “Now begins the very hard work of implementing this program in the way it was envisioned, with very high standards,” said the campaign manager for the Arizona Medical Marijuana Policy Project. Patients suffering from cancer, HIV/AIDS, Hepatitis C, and any other “chronic or debilitating” illnesses will be allowed to buy 2 ounces of marijuana every two weeks or grow plants, as long as they are backed by a doctor and registered with the state.