On a healthy adult, not a problem. Unless you're operating heavy machinery or something.

On an infant, potentially deadly.

On a child or old person with asthma or other respiratory problems, potentially deadly.

Rumsfeld acknowledged US ratification of the CWC but expressed "regret" about its restrictions, stating that the US has "tangled ourselves up so badly" on policy for use of incapacitating biochemical weapons.

Hold it. We're going into Iraq because Iraq might use chemical agents......

And our government is expressing "regret" about the restrictions on OUR use of chemical agents?

Rumsfeld indicated that - in his opinion - if President Bush signs a waiver of long-standing restrictions on US use of incapacitating chemicals, that the US will be able to legally field them in Iraq and elsewhere.

If we use CS in a city, people will die. We will have killed people by an intentional use of a chemical agent against a civilian population.

Top US military planners are preparing for the US to use incapacitating biochemical weapons in an invasion of Iraq.

Chemical weapons. Not "biochemical".