lol, you need to chill out a litle mate: i take it you were toking secretly? you probably just got very paranoid aka "The Chronic Fear". Chill, it may take a while not to think those thoughts again, just take it slow.

edit: plus, it's not possible for cannabis to do any damage in that way (making you permenantly retarded, lol)
BUZz UK Reviewed by BUZz UK on . Experienced repressed thoughts and temporary retardation from cannabis trip A few days ago, when I decided to indugle in my once-a-week cannabis indulgment with the strain Haze, I loaded up my bubler with less than half a bowl. Feeling a hard-on like I always do before I light up Mary Jane, knowing that fun, high times lay ahead for me, I took the lighter and bathed the buds in the lighter. Held in the smooth, skuny smoke for 3 secs, breathed out into the fan. Feeling nothing yet, I rotated the bud, and toasted the other side, taking 2 more hits. Next thing you Rating: 5