Try this one!!!

Don't smoke for three days and also stay away from smokers for these days.Then resume smoking after three days,then again quit for 10 days after the first resumption.This time whenever you feel the urge to smoke then eat fruits or chocolates.After these 10 days resume smoking but remember by this time you would be able to judge how much you really need to smoke a day.So from here cut down gradually your cigarettes from a packet to 5 then to 3 and then to 1.
There is no guarantee for this method as it depends on how strictly you follow the regime,but I did it and was successful.