I used to be a heavy marijuana smoker for over a decade. I didn’t smoke it for spiritual purposes, I just wanted to get high as fuck really and besides that I wasn’t actively practicing back then for the most part. However, I can safely say that the herb does give one a temporary boost to psychic perception and it helps a lot with getting into tgs or “gnostic trance”.
I’ve stopped smoking marijuana for about a year now and honestly my abilities are much stronger now. I guess that’s related to the fact that I’ve put a lot of work into practicing, since I didn’t have my “crutch” anymore. My everyday life has also improved quite noticeably since then, but again I was abusing the herb, I wasn’t using it for spiritual purposes so I don’t know if that’s relating to your case.
Mind-altering substances have always been used and they can indeed help quite a lot. However, in my opinion, they shouldn’t be used on a daily basis, they should saved for special occasions. First and foremost, you’ll depend on the herb for your practice and you won’t be able to do the job without it and on top of that, all of these substances have limitations. Also, most likely, abuse of of substance brings unwanted side effects which can be quite nasty depending on the situation. So, I think it’s best that someone works actively and daily on developing the psychic senses without the use of substances and save the plants for special occasions.