Maybe if it's pot with PCP in it or something. I did that stuff once without knowing it, boy was that startling.

Other than that, I've never hallucinated on pot. Ever. I've seen hints of stuff in the corner of my eye that isn't there and stuff like that, but nothing I would call "hallucinating". Acid makes you hallucinate. It makes you hallucinate for hours. Pot, from my experiences, does not. And I've smoked some pretty sweet shit.