Bon Jovi rocker Jon Bon Jovi quit drugs after a bad experience with phencyclidine-laced marijuana. The Bad Medicine hitmaker used to enjoy the odd joint, but when an acquaintance added the hallucinogenic PCP, he realised his drug days were over. He says, "I think it had some PCP on it. That was bad. "And that was pretty much the end of me ever doing drugs. I don't have the mental capacity to do them."