Hitler fell victim to a gas attack in WWI which no doubt left an impression with him.
In the Pacific theater, the US was stockpiling poison gas in Okinawa in preparation for Operation Olympic. If an invasion of the Japanese homeland was needed, the US was prepared to use additional atomic bombs, poison gas and even germ warfare to subdue the populace.
Gas also ran counter to the Germans lightning attack strategy.
Gas also ran counter to the Germans lightning attack strategy.