Jade Plant (Crassula argentea) is on the plant safe list so I would imagine it would be ok. Do you free feed? Could also be crickets looking for moisture.
I just ordered a big Jade tree for my chameleon. I've read numerous people saying their veiled chameleon loves to munch on the Jade leaves, with no ill effects. I decided to get one after constantly catching my veiled trying to eat the fake greenery in the cage. The fake is out, the Jade is in. She loves mustard greens almost as much as she does cockroaches and crickets, so she's going to go nuts for the Jade.