Hi and thanks for the quer,
it would be of interest getting a proper evaluation of this cough
, preferrably from a pulmonologist. there exist what is called chronic obstructive bronchopneumopathies, that inlcude chronic brinchitis and emphysema
. These conditions could asspociated with production, in a chronic manner, of excessive sputum. Lung abscesses could also present as such. Its important to get appropriate chest X rays done, pulmonary function tests and coupled with others that shall be guided by the clinical examination and the past history.
Booking an appointment with your pulmonologist is my advice. thanks and hope this helps,