How does Smoking Effect the Lungs?

Smoking affects the lungs by breaking down the tissue in your lungs, turning your lungs black and making it hard to breathe. This is called emphysema, and even if you quit smoking, it doesn't go away. It's like a severe form of asthma. You can find more information here: http://kidshealth.org/teen/drug_alcohol/tobacco/smoking.html
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