5. . When the air-sacs in the lungs are broken down by the harmful chemicals in the tobacco smoke, the surface are for the exchange of gases in and out of the body is reduced  more air has to be moved in and out of the lungs. The damaged lungs and increased rate of breathing make breathing more painful. This condition is known as emphysema.

6.  Smokers are likely to suffer from lung cancer than non-smokers.  The lumps or tumors, which are cancerous growths, block the air passage. This will eventually suffocate the person.