Cannabis may be driving a rising number of Americans to the brink of suicide, a study suggests.Researchers who analyzed national poison center data found that the number of people who had marijuana in their system when they tried to kill themselves has risen 17 percent every year since 2009.Of the 18,700 cases involving cannabis over the past 12 years, around one in 10 resulted in death or permanent disability - and younger people were more likely to be high on weed .
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