The Journal of the American Medical Association has just published the results of
a huge study of marijuana use in 2001-2 and 2012-13. Here's a brief excerpt followed by a huge image file:
Past-Year DSM-IV Marijuana Use Disorder
The prevalence of
DSM-IV
marijuana use disorder increased significantly between 2001-2002 (1.5%)
and 2012-2013 (2.9%), nearly doubling between the 2 surveys (
Table 2).
Within population subgroups, increases between 2001-2002 and 2012-2013
were statistically significant with few exceptions. Groups in which the
magnitude of increase was most notable included those aged 45 to 64
years (0.4% vs 1.3%); black individuals (1.8% vs 4.6%); Hispanic
individuals (1.2% vs 2.8%); those with the lowest income (2.3% vs 5.4%);
and those in the South (1.0% vs 2.6%).
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