An article was published on February 15th, 2008 in the Scientific American, explaining why the promising field of Nanotech can cause health problems, especially in workers producing these new materials:

As Nanotech’s Promise Grows, Will Puny Particles Present Big Health Problems?

Amid the great promise nanotechnology offers, big questions remain on health dangers posed by exposure to tissue-penetrating particles. It seems like a noble goal: amid growing concern about the health risks of nanoparticles, why not keep tabs on the health of people who work with the little buggers? But it turns out that’s easier said than done. Scientists have only the broadest suspicions about harm that nanoparticles may cause. How, then, to recommend which workers should be screened and exactly what they should be tested for?