The phlegm could be from your lungs, your
noseNose fracture, your sinuses or all three, because cigarette smoke can irritate the respiratory system from top to bottom. It is almost certainly aggravated or even caused by cigarette smoke and the best way to stop the phlegm is to keep on staying off the cigarettes. It may take 6 to 12 months for the effects of
smokingQuitting smoking
Smoking - tips on how to quit
Smoking and copd (chronic obstructive pulmonary disorder)
Smoking and smokeless tobacco
Smoking hazards to completely clear, so please be patient.