Your lungs work
If you were in a house fire last week, you would be coughing up "junk" for a week or two--it is your lungs that still have cilia that work like little brooms to sweep out the tar/smoke solids/etc.
From the cigs. It will stop. Humidifier
(/hot shower) can help with this, and help throat, often sore from frequency/intensity of cough
. Please avoid in future, your lungs will thank you!