Miley Cyrus caught on tape: Miley Cyrus celebrated her 18th birthday by experimenting with a bong and catching a case of the giggles but sources say she was not smoking marijuana.

The smoke filling the bong is a natural herb called salvia which has psychedelic qualities. Possession of salvia is legal in California.

In a video posted to TMZ, a person who appears to be the 18-year-old singer-actress takes a bong hit. Party in the U.S.A.! Miley’s camp has yet to respond.