. In this Friday Nov. 2, 2012 photo, Mykayla Comstock, 7, one of Oregon\'s youngest medical marijuana patients, admires her dress while her dog, Chase, looks on, in Gladstone, Ore. Mykayla\'s mother says she gives her daughter marijuana pills to combat the effects of chemotherapy, but her father, who lives in North Dakota, worries about the effects of the drug on her brain development. Mykayla was diagnosed with leukemia last spring. (AP Photo/The Oregonian, Beth Nakamura)
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