Ich schreibe es lieber in Englisch:

The negative effects of Asbestos are well established. Studies conducted by scientists around 2003-2005 seem to confirm that carbon nanotubes, extremly interesting materials with many potential applications in nano-electronics, may cause similar detrimental effects when inhaled. It is, however, still quite unclear what causes this toxicity and which types of carbon naotubes are more dangerous than others. I found this article which is quite interesting in this context:

http://www.nanowerk.com/spotlight/spotid=1600.php

KHG