You quit smoking right? It's quite common to have bronchitis after quitting, your lungs are shredding the tar and you cough your guts up to get rid of all the nasties, it's your cilia (the tiny hairs in your lungs) beginning to function normally again, so you're cough reflex gets better, I felt ill after quitting, sores in my mouth and coughing I never coughed while smoking so I was baffled after quitting, It should get better within 6 weeks if it doesnt go back to your doctor.