I've never had anything 'spiritual' per say when it comes to psychedelic states, but that might be just me? The only thing close to spirituality is feeling one with the earth, or appreciating the complexity of nature from a scientific standpoint. It's interesting learning about physics, nature, biology, astronomy, ect when you're baked. Religious people might appreciate it for the fact it exists because they believe a god made it, but truly understanding the minute mechanisms of how nature works from a scientific standpoint is far more rewarding