Forcing yourself to stop smoking for a certain amount of time may keep you quit for that amount of time
If you are not enjoying your progress as you quit and not genuinely noticing the positives in your physical being and mental attitude toward life in general, when your willpower runs out, so may your quit.
This is not about denial with willpower until you can't do it anymore, this is a lifestyle change.
Quitting smoking is not a negative. If all you think about is what you are giving up by not smoking, you may only remain quit for so long.
Smoking sucks! Haven't you noticed?