MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
A conceptual illustration of lungs with emphysema caused by tobacco smoke. Emphysema affects the lungs and the alveoli in the lungs where the exchange of oxygen and carbon dioxide occurs. The damage to the alveoli (shown in inset) prohibits them from taking the shape necessary for inhalation and breathing.
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