Smoking makes you more vulnerable to seasonal flus and colds.
Tiny hairs called cilia that line the respiratory tract, including the trachea and bronchial tubes, help protect you.
But one of the toxic effects of cigarette smoke is that it paralyzes the cilia, which erases that protection. That's why smokers have so many more infections.
Within a month of quitting, your cilia start doing their protective role once again.