How long after quitting the smoke can you expect to breathe normal again...?

I suppose I can't ever expect to really breathe like I should, I was doing 2 packs a day for over 5 years, but I quit 5 days ago, and practically the only withdrawal symptom after the first 'horrible' day without my cigarettes has been coughing and being constantly out of breath. In fact, I distinctly remember feeling great while I was still smoking, the last two days as a smoker I was breathing better than now..... I barely have cravings, and I definitely do not intend to relapse, so why the coughing and wheezing and shortness of breath after 5 days already????? How long till I breathe OK?