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6/11/2011 (CNN) -- United States health authorities have added eight commonly used substances to its official "Report on Carcinogens," saying they may put people at increased risk of developing cancer.

The industrial chemical formaldehyde and a botanical substance known as aristolochic acids are listed as "known human carcinogens" while six others, including certain inhalable glass wool fibers and styrene, used in Styrofoam, are listed as substances "reasonably anticipated to be human carcinogen," the U.S. Department of Health and Human Services announced Friday.

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