When I was 3 years old, I was a brat. I pulled out the tent stakes that a playmate was laboriously hammering in. He took the hammer to my head. I have 4 dents in my head and a large backwards "L" shaped scar that my hair hides. Because of this head trauma,I have had migraines and cluster headaches since I can remember. At 19, I finally smoked some pot. My headaches went away. The scar still hurts now and then, but it's nothing compared to what I used to go through. Only when I do not have pot, do the headaches return. Also, I do not mind the side effect of getting high. I have been smoking for just a few months shy of 40 years. I am "California" legal- I have my doctor's recommendation and I grow my legal limit.