Is the tar in cigarettes naturally in the tobacco, added to it, or is it produced when the cigarette burns?
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ANSWERS: 3
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bump.
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It is added to the cig.
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The closest answer would be that it is produced when the tobacco burns. Smouldering heat on dampish vegetation produces all sorts of weird chemicals from the natural vegetation. You get ethe same effect if you burn green wood on a fire: the chimney gets tarry instead of sooty.
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