I am a genuine, certified, bonafide, pot head. When I'm in a cycle, pot can be a trigger for me if I smoke too much. No matter what kind it is. During the worst cycle of my life I was willing to try anything and I quit smoking pot all together. It didn't have any effect on the cycle at all, but it did seem like the clusters were somehow more harsh and unforgiving than before. So I went back to smoking pot. And after a nasty cluster it deffinitly helps me to relax and feel normal again. But in my 25 years of having clusters, and my 20 years of smoking pot on a pretty much daily basis, I have no evidence whatsoever that leads me to believe that cannabis can prevent clusters. But it sure does make them easier to deal with.