I've definitely hallucinated the first time I smoked. My buddy and I were smoking up after a Red Sox playoff game outside his dorm, I had never smoked before and we smoked like ten bowls. After a while I was thinking this was a disappointing first smoke cause I wasn't really feeling anything. Then all of a sudden I was convinced me and my friend were on an epic Legend of Zeldaesque adventure while basically just walking around campus. Eventually we walk up to this picnic table and I think to myself it would be fun to run up and jump onto that table, out of nowhere I see myself run up and slide across the table fall off the other end a crack my head off the pavement. I then decided jumping on the table might be a bad idea.

The second time I experienced something like this I hadn't smoked for a good 3 or 4 month's, my buddy from the last story, my bro and a couple other friends drive out to this abandoned airport in the middle of nowhere. Me and my buddy smoke a giant blunt probably like 20 good rips a piece. were sitting in his car and all of a sudden I see zombies walking towards the car I start to freak out and try to get my buddy to drive away. He settles me down(he smokes pretty much every day, rather high tolerence.) Turns out it was just my bro and other friends walking towards the car. But I was convinced they looked like zombies through the car windows.

I think the less often you smoke the stronger the effects of the weed and the more likely you are to hallucinate.