Hey there Kloudiia,
I've managed to quit smoking for 3 months before. I did it using patches and by training weights three times a week, and doing plenty of walking, and eating good food! It was alot easier then than it would be now ... since I didn't have a fulltime job (well, I think so anyway).
I was determined to put on weight, and quitting smoking would help with that (I weighed 75kg/166lbs, and I'm 6'3"/193cm). Now I'm doing weights again, but often only get to do it once or twice a week since the guy I'm training with just got a new girlfriend and hes often out of the area
I've managed to achieve other things, like getting a degree, or setting a goal to finish a sudoku in under 3 minutes (which I did). But nothing that went really smoothly on a day to day basis ...
I mainly started again because my new girlfriend at the time was a smoker (the girl I just broke up with).