Migraine and marihuana

I just read a comment about my visual migraine aura video in YouTube

The shaping and flashing of it is near perfect; however, it needs Color, and, some auras loop into a closed figure, while expanding outward. Your simulation seems most accurate near the end of it, when the aura is larger and wider. I'm very very pleased that so many people are doing simulated Auras for migraine sufferers, this is extremely important educational information. I wonder if anyone has studied to see if weed has any treatment effect on migraine? I would use it if so.

I guess that this questions was asked by many people and probably answered by some of them in a self-experiment.

30 minutes or 19 years—know your risk

The video shows a neural network simulation of a visual disturbance that lasts in migraine usually about 20 to 30 minutes. However, in rare cases migraine aura can be longer. If it lasts longer than 7 days, it is diagnosed as persistent migraine aura symptoms (aka visual snow).  

In an internet survey initiated by Sofia Green, three people reported that persistent visual disturbances have occurred after using marijuana for the first time. All symptoms lasted many years, in one case for 19 years. You can read on the Migraine Aura Foundation more about this kind of Cannabis-induced persisting perception disorder.