Chemical weapons in WW1

Gas was introduced to the arsenals of WW1 in 1915.

Here is a short list of tables of the effect of gas and the amount produced.

All is taken from "Tanks and weapons of World war 1" Edited by Bernard Fitzsimons:

Casualties:

Apart from the American fugures, these figures are only approximate, and do in many cases differ from the official published figures witch, since they do not include men who died of the gas on the battlefield, tend to be far too low

Production of Gas:

Prodution of poison gasses during WW1, in Tons