Originally Posted by holograph

didn't watch it yet, but.. how is dreaming different from hallucinations? naturally without any pills.
don't sleep for a couple of days and you will also start hallucinating.
enter deep state of meditation and you may get similar to hallucinations effect

so it is very possible to get into state of hallucinating simply with placebo pills

on a side note, a human can hallucinate on all his/her senses not only visuals