Question

Can cilia grows back if you stop smoking?

Answer 1

Yes, within a few days of smoking, the cilia regenerate.

Explanation:

Smoking kills the cilia that line our nasal spaces and respiratory tract; they are responsible for filtering out particulate matter from the air we inhale, which is why smokers are more prone to respiratory infections and conditions.

Depending on how often and how much the person smoked, the regeneration of cilia starts shortly after the person quits. The regeneration process would actually cause the person to cough more as the growing cilia may irritate the tract temporarily.