When I gave up smoking, I got sick. I went through a period of coughing for months. I was coughing to the point of getting sick and wetting myself. At the time it was diagnosed as hay-fever. It turns out that it could have been from all the years of smoking and coughing up years worth of gunk from my lungs. I'm OK now thank goodness. No more coughing fits. I thought about that time lately and I thought if I was to give up now, I would think a cough would be viral related.