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The study, co-written by professors from Montana State, San Diego State, and the University of Colorado at Denver, analyzed 17 years worth of statistics in search of shifts in suicide rates per 10,000 people in states where medical marijuana was legal from 1990 to 2007. Using the statistics of states in which marijuana is still illegal as the control group, the study’s authors concluded that in states with legal medical marijuana, the suicide rate for males aged 20-29 decreased 10.9 percent, and for men aged 30-39 they saw a decrease of 9.4 percent.

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