Thanks for your question on Healthcare Magic. I can understand your concern. Since you are active smoker and having COPD (chronic obstructive Pulmonary disease), you are always at risk of lung infections. And this is the most likely cause for your bad tested sputum. So better to consult pulmonologist and get done clinical examination of respiratory system and chest x ray. You should quit smoking as soon as possible. You will also need azithromycin (broad spectrum antibiotic) for lung infection. Once this thing is over, get yourself vaccinate for adult respiratory vaccines like pneumococcal and influenza to prevent recurrent lung infections. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.