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The British Medical Journal reported in a Nov. 23, 2002 article by George Patton, MD, et al., "Cannabis Use and Mental Health in Young People: Cohort Study":
“Daily [cannabis] use in young women was associated with an over fivefold increase in the odds of reporting a state of depression and anxiety after adjustment…
Weekly or more frequent cannabis use in teenagers predicted an approximately twofold increase in risk for later depression and anxiety…
The prevalence of depression and anxiety increased with higher extents of cannabis use, but this pattern was clearest in female participants.”
Nov. 23, 2002