Congrats! So glad your quitting! I quit not too long ago and started doing circiut style work outs. The idea is to spend 20-30 minutes doing three different excercises. So you could do 15 crunches/situps, the 10 push ups (I do girly ones), then 15 squats. After you do all three you start the next round of the same thing again. I started doing it for 20 mintues then worked up to 30 mintues. It is not a huge cardio which is great because it will be perfect it you just quit smoking, but it still keeps your heart rate up to the fatburning area the entire work out. The first few days of this was really hard then it gets better, the results are very visable and I feel great.
You can change uf the excercises also just make sure your working out three different body areas. So you can swap squats for lunges, or the biclyle for situps.
Good luck!