John Claude Krusz, PhD, MD, Medical Advisor on the Board of Directors of MAGNUM at the National Migraine Association, on Mar. 23, 2005 said in response to "Studies About the Effects of Marijuana on Migraine?" on "Ask the Clinician" on

“The literature on the effect of marijuana on migraines is very poor, indeed. As you can imagine, it is not a topic the government will support readily. Most ‘studies’ are anecdotes and formal research is lacking. There is some theoretical information why cannabinoids may be useful in treating migraines and pain and there are also small published studies suggesting that marijuana can increase headaches.”

Mar. 23, 2005