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The Water Cooler
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Poll: Marijuana Law Reform
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<blockquote data-quote="_CY_" data-source="post: 2836838" data-attributes="member: 7629"><p>Largest ever longitudinal twin study of adolescent cannabis use finds no relationship between heavy use and IQ decline.</p><p><a href="http://news.meta.com/2016/01/18/twinsstudy/" target="_blank">http://news.meta.com/2016/01/18/twinsstudy/</a></p><p></p><p><strong>[Broken External Image]</strong></p><p></p><p>Marijuana is used more than any other recreational drug, with recent trends toward greater social and legal acceptance in some regions. Concerns remain, however, about a possible causal relationship suggested in scientific studies between marijuana use and decline in IQ, particularly among adolescent users. Other analyses have found no or inconclusive evidence for a link between IQ decline and marijuana use. However, most prior research, regardless of conclusion, has suffered from small participant cohorts, absence of pre-use data, potential influence of confounding effects, or some combination of these factors.</p><p></p><p>A new study led by scientists from UCLA and the University of Minnesota attempts to examine the link between marijuana use and IQ in a larger context. Reporting in PNAS, the authors analyze results from two longitudinal studies of twins, with data from more than three thousand individuals from Southern California and Minnesota. Participants were tested in six cognitive areas at two time points: between 9-12 years of age, with follow-up between ages 17-20. Study subjects self-reported marijuana use and frequency, and additional information, including genetic data, family background, socioeconomic status and use of other substances was collected at each encounter.</p><p></p><p>The study also found no relationship between heavier or more frequent marijuana use and the magnitude of IQ decline.</p></blockquote><p></p>
[QUOTE="_CY_, post: 2836838, member: 7629"] Largest ever longitudinal twin study of adolescent cannabis use finds no relationship between heavy use and IQ decline. [url]http://news.meta.com/2016/01/18/twinsstudy/[/url] [b][Broken External Image][/b] Marijuana is used more than any other recreational drug, with recent trends toward greater social and legal acceptance in some regions. Concerns remain, however, about a possible causal relationship suggested in scientific studies between marijuana use and decline in IQ, particularly among adolescent users. Other analyses have found no or inconclusive evidence for a link between IQ decline and marijuana use. However, most prior research, regardless of conclusion, has suffered from small participant cohorts, absence of pre-use data, potential influence of confounding effects, or some combination of these factors. A new study led by scientists from UCLA and the University of Minnesota attempts to examine the link between marijuana use and IQ in a larger context. Reporting in PNAS, the authors analyze results from two longitudinal studies of twins, with data from more than three thousand individuals from Southern California and Minnesota. Participants were tested in six cognitive areas at two time points: between 9-12 years of age, with follow-up between ages 17-20. Study subjects self-reported marijuana use and frequency, and additional information, including genetic data, family background, socioeconomic status and use of other substances was collected at each encounter. The study also found no relationship between heavier or more frequent marijuana use and the magnitude of IQ decline. [/QUOTE]
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