Smoking half a pack a day is on the higher side, in fact any smoking at all is bad. Once you have already had an episode of bronchitis. Now you wheeze when you exhale so possibly you might be heading towards chronic bronchitis. You need to stop right now, since once set in, chronic bronchitis has no remedy.
The chest pain you are having does not look like a heart pain but I strongly suggest you to get in touch with your physician and get whatever tests he suggests, like an X ray of the chest, an EKG etc.
Dr Apurva C Madia
Consultant Cardiologist and physician