Vidya Balan didn't let anyone smoke on the sets of Kahaani.

And on days when no-one was caught with a cigarette, not even the chain smokers, she would call for a cake and chocolates for everyone.

As reported ('No smoking, says Vidya'; Hitlist, February 9), even director Sujoy Ghosh was not allowed to light up during the shoot. And when he tried smoking, he was caught on camera by crew members and then punished by the actress.