Hello and hope you are doing well.
The treatment for bronchitis is based on your symptoms. Bronchodilators are given for bronchospasm and antibiotics if there is an element of infection. If you are a smoker and have developed long standing lung infections/inflammation it can compromise your lung function. To improve lung function practice breathing exercises and quit smoking.
Hope this helped and do keep us posted.
This may be from an allergy I would say go to the doctor see if some meds maybe help you, what are your symptoms ?