Nothing, save for an exceptionally good friend who'll hide your cigars from you. Not to mention, it's not too hard just keep thinking about lung cancer, bad breathe, etc. and you should start feeling repulsed by the urge to smoke. I personally just stopped buying them and I hurried past the place where they selled cigars in the stores (it was extremely hard but if I can do it so can you!)
I knew some kid in college who would use one match to light all his cigarettes. That is, he'd light the new one from the old one, continually. He didn't make it through the year, however. "Cigarette Smoking cures people -- one by one." I figure if he can die in pain from cigarette smoking, so can you! Or use a nicotine patch.