does cigarette tar ever go away π The image of blackened lungs isn't a prop. It's the harsh reality of smoking. While healthy lungs are a pinkish color, smoke causes permanent, heavy staining from and other particulate Tar from cigarettes - Stock
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A.RasanenL.FidanzaF.MenottiA.NissinenA.et al (2001)

Metabolism of benzo[a]pyrene to trans-7,8-dihydroxy-7, 8-dihydrobenzo[a]pyrene by recombinant human cytochrome P450 1B1 and purified liver epoxide hydrolase

With magnification, you can often see lines of fine hairs that run down the back of these beetles

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