"One of the biggest things that affects the lungs with smoking is the intake of oxygen. Under normal breathing circumstances, you inhale just air. It is not always fresh, but it is still just air. When you do this, your lungs fill up and and expand normally. But when smoking, you are not breathing in all air. You are breathing in some air and some smoke at the same time. This has a negative affect on tiny hairs called cilia inside the lungs. These are used to filter out particles of dust and foreign matter."
Read more: How Does Smoking Affect the Lungs? | eHow.com http://www.ehow.com/how-does_4564272_smoking-affect-lungs.html#ixzz2PdBGWeI7
The picture above is showing a non smoker and a smokers lungs. As you can see smoker lungs become very black and ugly. Also people that smoke have a chance of getting lung cancer.
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