Smoking

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  • Damages the walls inside the alveoli, reducing the surface area for gas exchange and leading to diseases like emphysema
  • The tar in cigarettes damages the cilia (little hairs) in your lungs and trachea. These hairs, along with mucus, catch a load of dust and bacteria before they reach the lungs. The cilia also help to keep the trachea clear by sweeping mucus back towards the mouth

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