I think the less obvious point is that you don't really know what the effect will be. Thanks to crazy drug policies gone amok, we still have very rudimentary understanding of their impact until recently passed mostly on a word of mouth basis.

There are stories of actual mind blowing experiences that truly do expand your mind. I did not share my personal experience, because a feeling of absolute peace while being engulfed by light is not that uncommon and hardly life changing unless you are easily swayed anyway.

There is a chance your mind will expand. There is a chance something bad will happen. It is a gamble, but I personally think we are still in dark ages of drugs. Maybe one day we will know how exact dosage affects specific mental profile.