Smoking is injurious to health.

Lung cancer is one of the most common causes of death in the world. The upper part of the respiratory tract is provided with small hair-like structures called cilia. These cilia help to remove germs, dust and other harmful particles from inhaled air.
Smoking destroys this hair due to which germs, dust, smoke and other harmful chemicals enter the lungs and cause infection, cough and even lung cancer.