Depends on every person, you cannot generalise, especially if you do not have such experience. LSD unlocked me a door in my head and I know I'll never be the same as before, I think my brain somehow changed physically. I lost lot of fears and could analyse myself as being part of nature. I was 19, now I'm 33 but I still enjoy remembering that moments; I took it 4 times. BTW I'm not a hippie but SW engineer :-)