Nah, it's fine. At colonoscopy doses, if you fight it, you can remain semi-conscious, and the process of coming out from sedation is pretty trippy as bits of your brain that have been muted come back online at different rates. It's unique, it's legal, it won't show up on a drug test, and it's as near to 100% safe as any drug use can be. (You're in a hospital, for crying out loud!)

(Plus I like watching the video feed from the camera. How many other people have seen the inside of their colon, live? It's cool!)