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179 °C 495 °C Benzo[a]pyrene is found in coal tar, in automobile exhaust fumes (especially from diesel engines), tobacco smoke, marijuana smoke, wood smoke, and in charbroiled food. Recent studies have revealed that levels of benzo[a]pyrene in burnt toast are significantly higher than once thought, although it is unproven whether burnt toast is itself carcinogenic. A vast number of studies over the previous three decades have documented links between benzo[a]pyrene and cancers. It has been more difficult to link cancers to specific benzo[a]pyrene sources, especially in humans, and difficult to quantify risks posed by various methods of exposure (inhalation or ingestion). Researchers at Kansas State University recently discovered a link between vitamin A and emphysema in smokers.[1] Benzo[a]pyrene was found to be the link to the deficiency, since it induces vitamin A deficiency in rats.
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