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Study: Cannabis May Cut Headache And Migraine Pain In Half   PULLMAN, Wash. (CBS Local) — Cannabis could be used to relieve headache pain, a new study from Washington State University suggests. Inhaled cannabis reduced self-reported headache severity by 47.3 percent and migraine severity by 49.6 percent, according to new research. The study, conducted by Washington State University and published online in the Journal of Pain, is the first to use data from headache and migraine sufferers using cannabis in real-time. Previous studies have asked patients to recall the effect of cannabis use in the past. “We were motivated to do this study because...