I wouldn't jump to blame it on weed which you smoked so infrequently. it looks like you are on Depakote which can cause cognitive deficits as well. I would talk to your pdoc about your forgetfulness and see what he has to think about it. I know when I took it, I would forget what I was saying in the middle of a sentence. I just couldn't deal with that so I quit taking it. check into it. there are many more meds out there to choose from. take care.