I think everybody is different. I smoked for 35+ years. When I quit, it was because I had pneumonia. Following that I literally used a box of kleenex a day for almost 18 months and I'd never previously had sinus issues or allergies. I still saved money, by the way! Then one day it just stopped: my sinuses were once again completely clear, as well as my lungs. My doctor told me he'd seen all manner of combinations of symptoms or total lack thereof. If you're not coughing, or suffering from sinus-type symptoms, be thankful, you're lucky.