Hemp for Headache: An in-depth historical and scientific review of cannabis in migraine treatment,
by Ethan Russo, MD, a clinical child and adult neurologist.

One of the more interesting aspects of Dr. Russo’s paper is his remarkably detailed section entitled, THE HISTORY AND ETHNOBOTANY OF CANNABIS IN HEADACHE TREATMENT (emphasis his). The good doctor has reason to be proud of his research, as it describes and documents cannabis (hemp) usage back through seven thousand years of human history.  Really, seven thousand.  Enjoy the read.

http://ontheshelf.com/attached-file/MigraineStudy.pdf