marijuana addicts "made up about 1.5 percent of Americans. But they accounted for eleven percent of all the psychosis cases"
among "1,600 psychiatric patients ... cannabis use was associated with a ten-fold increase in violence."
"survey of more than 9,000 adolescents" "found that marijuana use was associated with a doubling of domestic violence... among 6,000 British and Chinese men and found that drug use—the drug nearly always being cannabis—translated into a five-fold increase in violence."
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