- The number of adults using marijuana more than doubled in recent years, according to new research culling data from two massive surveys. In 2001, just 4.1 percent of adults said they used marijuana. That increased to 9.5 percent by 2013. The findings were published Wednesday in JAMA Psychiatry. https://www.washingtonpost.com/news/to-your-health/wp/2015/10/21/marijuana-use-more-than-doubles-in-just-12-years/ 26 comments science
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