FRANKNOTE

The worst printers released amounts of ultra-fine particles rivaling plumes of secondhand smoke. When inhaled, the particles -- tiny flecks between 100 and 1,000 times smaller than the thickness of a human hair -- can work their way deep into the lung, leading to heart and lung disease, scientists say. Laser printers in the study were manufactured by Hewlett-Packard, Toshiba, Ricoh and Canon. All use toner, a powder used instead of ink.