Can you please explain this paragraph?

This person is basically stating that while on this particular drug there is been noted experiences of different or seperate consciousness which he believes to be proof of something bigger. He believes that these altered states are important insights to the mind, metephysical reality and existance. The experience seemed to inspire existential questions in the author. In my opinion, there is no special significance to such experiences. The brain was not designed to operate on nitrous oxide, and reacts accordingly. The diffrent states he describes are simply the result of intoxication, just like any other sort. There are other destructive ways one can achieve an altered reality, but these realities are not real, they are simply the brain malfunctioning do to a poisoning. He says there is a field of application for these states of mind, but he is wrong, and striving to prolong such experiences will inevitably lead to health risks/problems, and death. We are given what we need to try and master this reality, and this reality only, and all others are in the authors words "artificial", or in other words, fake, manufactured. It's natural to be curious, but to take it too far is to attempt to repeat history by ignoring it's lessons. He is not the first to imply much more significance to the experience than is warranted.