Cannabis use and abuse have increased significantly during the past few years, especially in states where use of the substance is now legal, new research suggests.

A retrospective study examining data from the US Healthcare Cost and Utilization Project (HCUP) showed that emergency department (ED) visits with International Classification of Diseases, 9th Edition (ICD-9) coding for cannabis use grew 50.4% between 2007 and 2012 in Colorado ― one of the first two states to legalize both medical and recreational use of marijuana.

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