"New research raises additional concerns about the harmful effects of formaldehyde, a common chemical found in everything from plywood to nail polish, car exhaust and cigarette smoke.

Formaldehyde has long been linked to rare tumors of the nasopharynx, which includes the back of the throat, which affect about 2,000 Americans a year, according to the American Cancer Society.

The new study -- the largest to date on workplace exposures -- provides further evidence linking formaldehyde with cancers of the blood and lymphatic system. These cancers are far more common, affecting nearly 140,000 Americans a year."

Liz Szabo reports for USA TODAY May 13, 2009. [2]