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'OGNITION: <br />PERSISTENT CANNABIS USE DISORDER LINKED TC <br />SIGNIFICANT IQ DROP <br />BETWEEN CHILDHOOD AND MIDLIFE <br />v <br />0 <br />2 <br />� <br />— <br />M <br />v <br />•- <br />a <br />v <br />Q) <br />CI <br />-2 <br />I <br />Q <br />�0 <br />M <br />-4 <br />o <br />v <br />a <br />as <br />v <br />- 6 <br />a <br />a, <br />Q <br />8 <br />Followed 1,037 individuals from birth to age 38. <br />Tested marijuana use and disorders at 18, 21, 26, 32 and 38. <br />Tested for IQ at ages 13 and 38 <br />Non-users Diagnosed 1X Diagnosed 2X Diagnosed 3X <br />11 <br />Source: Meier MH et al., PNAS Early Edition 2012 <br />