Is it true Cyanide is a painless poison?

Question

Is it true Cyanide is a painless poison?

Answer 1

Cyanide is the most rapid of all poisons . When inhaled as a gas , its action is instantaneous . With small doses , the person first experiences headache , confusion , giddiness , nausea and some loss of muscular power ,. Massive doses may produce sudden loss of consciousness and prompt death from respiratory arrest . If a large dose is taken  , symptoms usually occur at once but in some cases symptoms appear after a minute during which the victim may perform certain voluntary acts  such as corking or throwing away the bottle or walking a little distance . Survivors of serious acute poisoning may develop delayed neuriologic sequelae , especially in the form of parkinsonian symptoms .

Answer 2

I dont know for sure for im thinking it should be a quick but agonizing death. You will feel like you are suffocating while you are breathing