I was in the hospital room a little over a week ago with my wife and in-laws watching my father-in-law taking his last choking breaths before dying from emphysema. He smoked for over forty years, and did until the day he went into the hospital for the last time. Both of them smoked, and both of them "quit" several times in the last fifteen years. Seeing him decline starting five or six years ago finally was enough to make her quit for good. First he was not able to walk very far, then not able to do any of the things he enjoyed, went on an increasing list of medications and inhalors, oxygen part-time, landed in the hospital every few weeks, oxygen full-time, then was told he had three to five months and that he was not going home again. He pretty much gave up at that point. We took his dog in to see him a last time and he was dead a week later.
C.S. Lewis, who was writing in the forties and fifties when it was almost required to smoke, said that he could abstain, but he found it difficult to concentrate on anything else when he did. Not smoking was a full-time occupation. It is, it may be the most difficult thing you have done to this point. But it is too important not to stop.
From what I've seen I have to agree that cutting down doesn't work for most people, the number usually goes back up. Cigarettes and alcohol have to be the most difficult things to quit - they are just so accessible. Go places where it is not possible to smoke, avoid the situations where you would normally have one, make it as inconvenient as you can to go out and get a pack. Find something that you can substitute to get you through just that particular craving. Having someone who is also quitting (or is at least big enough to physically restrain you) can help. Instead of going out for a smoke break call them and have them help you get through that. Eventually it gets better. If you need more motivation, call the pulmonary section of a hospital and arrange a visit, it's not something you want your family to go through.