Interesting that this was brought up at this juncture, as I was just pondering that very topic. I was in a car accident about a month ago and my neck has been fucked up since, and as a result I get these unholy headaches. I've noticed recently that after I smoke a bowl, my head doesn't hurt so bad and my neck stops hurting. I attribute it to the weed I'm smoking right now, "Grandaddy Purps", I don't know it's geneology, but it's purple and dank. So in a roundabout way, that's my vote lol.

btw, i wasn't at fault in the accident, so their insurance is covering my medical bills