If you are prone to hay fever, you may find that they are more noticeable now that you don't smoke. Some of the "stuff" in ciggies helps to mask a lot of the allergies. One of those double edge sword deals unfortunately. I know my allergies have been worse since I quit the cigs.....at least 3 fold. But, I'll deal with head stuffiness and taking little pills when I need to over the tight chest with exercise any day.
I don't have asthma when I smoke. It comes back every time I quit. It's annoying because you're supposed to breath BETTER when you don't smoke.