Not that big in itself, as it can be used for illumination, but through its use as an "anti-personnel" weapon it could be seen as tantamount to the use of a chemical weapon.
http://www.guardian.co.uk/international ... 79,00.html
http://news.bbc.co.uk/2/hi/middle_east/4440664.stmDid US troops use chemical weapons in Falluja? The answer is yes. The proof is not to be found in the documentary broadcast on Italian TV last week, which has generated gigabytes of hype on the Internet.
Like other unlisted substances, it may be deployed for "Military purposes... not dependent on the use of the toxic properties of chemicals as a method of warfare". But it becomes a chemical weapon as soon as it is used directly against people. A chemical weapon can be "any chemical which through its chemical action on life processes can cause death, temporary incapacitation or permanent harm".
http://www.guardian.co.uk/Columnists/Co ... 31,00.html