Marijuana will not cause you to hallucinate. If you do see something its because you concentrating on it really hard, or your just freaking out cause your so high. When i first started tokin, and i closed my eyes i thought i was gonna keep on falling straight down. Eventually tho i just learned to enjoy the sensation. Also my bro and a friend have said that they've seen a leprechaun, but only because they were super paranoid. And they never really saw it, just out of the corner of their eye. Lol idc i want to see a fuckin leprechaun haha. But ya, you wanna hallucinate, try shroooooms. Now theres a trip.