I definitely got into Magick, Zen, mysticism, etc, because I experimented with psychedelics in my youth. I was a hardcore atheist already in my early teens, basically despising all religions. In my early university years, I got introduced to cannabis, LSD, mushrooms, MDMA, salvia and some other psychedelics. On the discussion boards (Usenet at the time) a person I highly respected said that a book called Zen and the Brain is really great. I found the book but I still remember being repelled by the name "Zen" on the cover, because I thought it reminds me of religions too much.
A similar thing, even stronger, happened with Magick.
Through the psychedelic experience and the community, I learned that there's at least something in these systems.
These days, I practice Magick and some other systems daily, but use psychedelics very scarcely.
On the end note, I basically went too far with the psychedelics, which took many years to recover and I'm not sure I'm all done yet.
So take care!