Yep, you gotta want it for yourself, and not just to keep other people happy, I've found.  Ten years ago, I could smoke a pack a day and still run four miles in thirty minutes, then six years ago, I got bronchitis and kept smoking right through it.  Lungs haven't been quite the same since, but I still didn't quit for good until three and a half years ago.  I finally asked myself why I was trying so hard to kill myself.  Haven't smoked since June 06.