Hey SC-
Well, what do you think is the best way to motivate yourself?
You said you wanted to be able to breathe better. However, clearly that isn't doing it for you.
So, some ways to motivate yourself:
~Investigate the ill effects of smoking further (this might not be your way; but I'll include it because it might be helpful to
someone else reading this). This could be anything from looking at pictures of diseased lungs, for example, to reading about the health problems that develop with continued smoking, to going on forums and reading first-hand accounts of people who are suffering from health issues because of smoking.
~ Reward yourself for not smoking in some way. This could be after every day of not smoking, giving yourself some small reward, or after a longer period, giving yourself a larger reward. You could even put aside in a jar the money you would have spent on smoking for this purpose.
~If you are into fitness, set physical goals for yourself to be able to accomplish that you currently cannot accomplish because you get short of breath.
Etc.
Find what motivates YOU, and figure something out based on it.
Of course, truly WANTING to quit is enormously helpful. If you're not quite there yet, then do plenty of research on the consequences of smoking, and FEAR THOSE THINGS. Because they don't just happen to "other people". That might be enough to get you where you want to be mentally - actually WANTING to quit, rather than wanting to want to.
Good luck to you! With a true desire to quit, and the proper motivation, YOU CAN DO IT!
Peace.