@jiboo420 – Using ‘gay’ to mean ‘lame’ makes you (and anyone else who does it) look like an idiot. Take it out of your lexicon and do the world a favor.
I think it’s not illegal on a grand scale yet because, so far, it hasn’t been much of a problem. Some states have made it illegal, but this is the typical knee-jerk, puritanical reaction of the U.S.—we don’t really know what it is, it’s potentially a recreational substance, so we have to make it illegal.
Honestly, I doubt Salvia will ever gain widespread recreational use, as with other substances. It’s way too intense and can be really scary because the taker can be entirely unaware of the world outside of his mind. Hallucinogens are not something to be taken lightly, you have to gauge your mental state and whether you think you can handle the complete reordering of your thoughts and such.