Seattle Times, 11 Nov 2012 – THE voters have approved Initiative 502. A year from now, once licenses have begun to be issued to growers and sellers, it will be legal for those 21 or older to purchase up to one ounce of marijuana. Today, an estimated 20 percent of 10th-graders and 26 percent of 12th-graders in our state have used pot at least once in the prior month. No one can say with certainty whether the new law will have an effect on youth.