Cigarette filter prevents the tar exist in cigarette, reaching and sticking to the lungs via Bernoulli principle . The filter on the cigarette holds some of the tar; releasing as much.
The tar drawn from the cigarette sticks to and blocks hollow cavities in the lungs called alveolus. The purpose of these cavities are to deliver oxygen from lung to the blood. The blocked alveoll can no longer serve this purpose and maintain required oxygen to the blood.
That's why long-time addicts gasp for breath easily, even after a light physical activity.
Cigarette filter delays this inevitable state for addicts. The tar hold on the filter elongates the health of the lungs and life confort.
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