Well, this is what's weird: I was smoking a lot of pot at the time... like, at least several times a day. Yet I never had any known mental illness before this and pretty much never smoked enough weed to cause me any problems whatsoever. But after I got a concussion (skiing accident) I remember going downhill really fast. I started getting self conscious, started getting anxiety when I smoked and within a few months I was starting to dissociate every time I got high. And then the wheels just totally fell off and I got DP about four months later.
I think the crazy thing about this is that I never put this whole thing together till now. I knew there was a time when things just shifted and I couldn't handle weed anymore, but I could never figure out why. I'm still not 100 percent sure it was the concussion but it's the only thing I can point to that I remember and it just fits the timeline perfectly for when this all started.
I dunno, just wanted to see what everyone else thought. Seems like quite a few people have a link to some kind of head injury though...