There was a bigs story on this stuff in the local news. Several kids were doing it and apparently there is a loophole in the law regarding its legality. Not sure what the current status is.
A bit I found online -
Salvia divinorum is a plant used for its psychoactive effects. Given the right dose, individual, set and setting, it produces a unique state of 'divine inebriation' which has been traditionally used by Mazatec healers. This inebriation is quite different from that of alcohol. Salvia divinorum is both similar to, and different from, other drugs that affect the brain and behavior. In many ways Salvia divinorum is a unique 'magical' herb. Salvia (and the salvinorin it contains) is very difficult to categorize pharmacologically. It does not fit well into any existing pharmacological class. Louis Lewin, the father of psychopharmacology called vision inducing drugs 'phantastica'. Let us dust off this venerable term and recycle it by calling Salvia divinorum a 'phantasticant'.