My advice would be to go get it checked out, only a doc can tell you for sure what those weird feelings mean.
To me, as a COPD (Chronic Obstructive Pulmory Disorder) sufferer it sounds lung related. Maybe a combination of the the smoke you have been inhaling and, as you do get bronchitis and have had pneumonia, your lungs may be more suseptible to getting a virus infection which may affect you more than the next person. Oh, and I have to tell you that anyone can have asthama, age doesn`t come in to it. I had it real bad as a child but it disappeared by the time I was seventeen. Got it back later but that is all mixed up with my lung damage stuff (smoker )

It could be something, and most likely nothing, but, again, the very best thing you can do is to go get it checked out. Don`t leave it. If it bothers you that is reason enough.
Please keep us posted.

Chris