MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
Stages of lung damage of a smoker leading to emphysema. The illustration cycles from the top left healthy lung down and around to the top right lung suffering from emphysema. Healthy lungs showing a healthy alveoli. Particles become trapped in the alveoli which triggers inflammation. Inflammatory chemicals dissolve in the alveolar septum, and large cavities become lined with carbon deposits, which lead to emphysema.
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