Why do smokers cough in the morning?

Answer 1

When you go through periods of not smoking, like when you're sleeping at night, your damaged cilia can't move the phlegm up to your throat where you can swallow it. Smoking does cause extra mucus to develop in order to get foreign toxins out of your lungs this makes you cough.

Answer 2

They have mucus in tgheir liungs and the mucus sticks to the tar and gets spat out of the persosn mouth when they cough.