here is a commercial link with info about poppers and they say it's still illegal in the U.S.:

http://www.epoppers.com/poppersfaq.shtml

On a suggestion of one of my partners I've used poppers once, but I must say that they didn't do anything for me, except for giving me a little headache. For me it was a waste of money. But then, a long time ago in my teen years weed didn't do anything for me. I guess I'm just immune for certain kind of drugs others get all crazy about. Luckily alcohol still gives me a kick every once in a while.