Deadliest gas on the world?

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Well it's not really a matter of opinion. Some gases are deadlier than others although it depends on the context. Which do I personally think has the worst effects? Probably Mustard Gas. Apart from fucking up your skin it blows up the veins in your lungs and causes you to drown in your own blood. Btw KingWolf Anthrax is a virus, not a gas. It's spread by inhaling the spores which are airborne.