How To: See the tar residue from one cigarette

See the tar residue from one cigarette

How to See the tar residue from one cigarette

See the difference between a tissue you've exhaled into first with a mouth full of smoke and then with the exhale after you've inhaled the smoke into your lungs. The difference will illustrate how much tar from one cigarette gets left behind in your lungs when you take a deep drag.

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