Thank you for your question. It is possible that you are developing an upper respiratory tract infection. The odor of your sputum may be due to bacteria which has infected your lungs. Furthermore, you can still be exposed to second hand smoke, even though your parents smoke outdoors. If smoke remains within their lungs when they return indoors, you will be exposed to it. Please follow up with your doctor to have a respiratory examination.You will likely need to be treated with antibiotics to clear this possible infection.
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