Hi there....we understand your concern. However firstly, you have to completely stop smoking and even drinking altogether. Else this problem will never go away. It will recurrent whenever you start smoking again. Also since your getting sputum, was it sent for sputum culture and sensitivity? Sometimes the colour, consistency, smell, quantity of sputum itself can indicate what type of disease you could be suffering from. Also does it increase on exposure to dust or pollens, as allergies are also very common. So kindly consult a pulmonologist for further evaluation.