You can start to see how the smoker’s lungs below became so discolored. Smokers don't just put a total of a few hundred cigarettes in their system; they literally deliver hundreds of thousands of cigarettes over their shortened lifetime. This discoloration effect is more than just aesthetically unpleasant--it is in fact deadly.
Above: Normal city dwellers lung.
Note black specks throughout indicative of carbon deposits from pollution.
Compare this to the lung below.
Smokers lung with cancer. White area on top is the cancer, this is what killed the person. The blackened area is just the deposit of tars that all smokers paint into their lungs with every puff they take.
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