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Cigarettes contain many harmful ingredients and toxins in them. When you smoke, you are breathing in everything that the cigarette contains. Smoke from cigarettes has tar in it, and that tar sticks to your lungs. The important part of the lungs that cleans out dirt are damaged, even if you're just getting second hand smoke.

Another answer:

The chemicals in the cigarette such as nicotine and tar, starts to fill up your alveoli, because of these chemicals in your alveoli, they start to pop. The popping of your alveoli results in a shortage of oxygen for your body to function.

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14y ago

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