There are similar concerns over carbon nano tubes, being that they actually resemble asbestos fibres. https://www.cdc.gov/niosh/docs/2013-145/pdfs/2013-145.pdf
This guy shows that CNT's can be modified to not be so pathogenic.
http://onlinelibrary.wiley.com/doi/10.1002/anie.201207664/abstract
There is a raft of material on working with nano stuff and the potential implications, both toxicological and environmental. raising safety issues is not trivial. just look up nano material or engineered material safety and see that there are many articles on this topic, or search it at the NIOSH website.
Ann: Change of Director's Interest Notice, page-55
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