It suffocated them relatively slowly. It was horrible. But isn't cold-blooded murder always horrible?
Note: Zyklon B has this effect on all people, not "just Jews".
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Zyklon B was the trade name under which hydrocyanic acid was sold to the SS. It is a poison (cyanide): it does not 'suffocate' people.
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it was what the germans used in the gas chambers on the jews it killed them that is the effect
Zyklon B was the poison used in the Auschwitz gas chambers.
Because, Zyklon B is a poisonous and toxic gas which will kill people withing 15 minutes
Zyklon B
Zyklon B, I believe.
Carbon Monoxide or Zyklon b