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white phosphorus can cause asphyxiation in enclosed places like bunkers and tunnels in two different ways. By consuming all the oxygen, or by inhalation of the smoke it gives off.
The smoke given off by WF is mostly Phosphorus pentoxide. It causes severe irritation and burns to eyes and the respiratory tract.
Using WF off-label as a tear gas dates back to 1916.
That’s a particular statement, considering the US has the oldest democratic constitution in the world.