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| | Occupation |
 | | Some 40 years later, certain constituents of tar, soot, and oils, known as polycyclic aromatic hydrocarbons, were found to cause cancer in laboratory animals, thus identifying the specific substances causing cancer among workers in these occupations. |
 | | Preventive action was taken in Denmark, where the chimney sweeps' guild, spurred by Pott's report, urged its members to take daily baths. |
 | | The success of this action was noted in a report in the 1892 British Medical Journal, "Why Foreign Sweeps Do Not Suffer From Scrotal Cancer," which pointed out that the sweeps of Northern Europe seemed to benefit from this hygiene measure, but English sweeps, who apparently ignored such recommendations, continued to develop cancer. |
| rex.nci.nih.gov /NCI_Pub_Interface/raterisk/risks94.html (367 words) |
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