I use them because I want to. I want to have fun. I want to sit in awe staring at a beautiful forest for hours. I want to write crazy guitar riffs and interesting lyrics to a song. I want to be tripped out. I want to feel like the music I hear is inside of me and part of me. I want to be one with nature. I want spiritual enlightment. There are plenty more. Simply..I do it because I want to.