Hello elusive, welcome to the nexus! You may want to consider adding a few spaces after a few lines of your post (not too late to edit!) it makes it a lot easier to read for all of us and in doing so will generate more responses I am sure

I know what you mean by the twin-slit experiment - it's absolutely amazing, beautiful and totally strange world with live in, isn't it?

So, if I understand correctly: after hearing about your experiences with different substances, your girlfriend thought you were losing your mind so you have stopped everything for now except cannabis? Are you still with this girlfriend? How do you think she will feel about using psychedelics again?

Peace to you and welcome again