ZAC EFRON is trying to give up his smoking habit by puffing on an electronic cigarette.
The High School Musical star has kicked tobacco in favour of fake cigarettes, which use vapour and nicotine to help quell smokers' cravings.
And the hunk indulged himself by taking his gadget with him on a night out in New York last week (ends16Sep12), but reportedly couldn't help sneaking out for the real thing midway through the evening.
A source tells New York Post gossip column Page Six, "He was puffing on the electric cigarette with friends in a back corner booth but then he went outside and walked down the block to sneak cigarettes."
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