16 yr. old laced weed dementia?

I am 16 years old and have smoked laced weed. I don't know what the weed was laced with but now I'm afraid it is causing dementia. I forget things about family and stuff easily. Also, stuff thats happened in the far or recent (Days, or even minutes ago) past seems to have happened longer ago then it actually happened or, I just don't know how long ago they happened. What's happening?