Zac Efron has no plans to screw up his Hollywood dream -- and he knows exactly what to avoid to make sure his star continues to rise.So what's on Zac's no-way list? Marriage and heroin.Girlfriend Vanessa Hudgens may be giving the star of the new flick 17 Again the cold shoulder after he told GQ he won't be getting married any time in the next two decades or so."I'm definitely not getting married. In this business, you're either getting married or they want you to be pregnant," he tells the magazine. "I'm not getting married until I'm 40. If ever."He also says he got some very wise advice from another star who parlayed teen hearthrob-dom into a thriving career: Leonardo DiCaprio.Zac says Leo told him to stay away from a particular vice to keep his career -- and life -- afloat."He said, â€˜There's one way that you can really (expletive) this all up. Just do heroin,'" Efron says. "If you steer clear of that -- the other obstacles you'll be able to navigate.' And that makes sense, dude."Apparently other Class A's are fine, though?
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