I have found that if you stare at things when you've smoked ALOT and then look away those things will be there. I dunno you ever seen one of those things on ebaumsworld.com or something where you stare at a dot in the center of a picture and then look at the wall and the picture appears on the wall. Well one time I was looking at the fireplace and we had a fire going and then I looked around and thought the whole house was on fire. Never happened before or again though... but thats the only thing close to hallucinating I've seen.