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When inhaling, the hairs in the nostrils and villi throughout the whole respiration tract clean the air, by removing the dirt from inhaled air. This dirt is excreted as mucus and is coughed up. - Smokers tend to collect more mucus and dirt in their lungs and cough it up more as they damage their small villi hair through the tobacco smoke. The air they are breathing is also dirtier, so their is a higher percentage of particles collected.

The respiration system is through the mouth/nose, down the trachea, through the bronchi, into the bronchioles, which seperates out into alvioli.

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