It's incredibly creepy, like people insisting you join their religious or sexual cult. It's definitely beyond "hey the grand canyon is cool to look at" or "motorcycles are fun" and is way out there next to "wild eyed moonies handing out flowers at the airport." I'm always creeped out by HN threads on the subject, along with the ones on depression and the collection of fruit salad antidepressants/speed some people need to get through the day.

Mind you I have had positive experiences with psychedelics; I wouldn't push them on anyone, and think it both creepy and unwise to do so.