ELLA MARU STUDIO / SCIENCE PHOTO LIBRARY ELLA MARU STUDIO / SCIENCE PHOTO LIBRARY
Smoker's lungs. Illustration of lungs moderately damaged by smoking. At top is the voicebox and trachea, leading down to the lungs. The trachea splits (at centre) into the bronchi that supply air to each lung. Cigarettes contain cancer-causing chemicals and the addictive drug nicotine. Tobacco smoke is the major cause of lung cancer and several other lung diseases such as emphysema, a disorder where the air sacs in the lungs become enlarged and damaged reducing the surface area for the exchange of oxygen and carbon dioxide. For less and more severe damage, see images C030/8663 and C030/8662.
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