Once poisoned does it matter if I stay in poison clouds?

Whenever a thin man gobs phlegm all over one of my guys I always move him away next turn. But I've been wondering about whether I need to: after all he's already poisoned.

Do poison effects stack? Does the poison expire after a number of turns and staying in the cloud renews this count? Is there something else I'm not thinking of?


If you are poisoned and run through a poison cloud, the poison counter resets.

You will get the "Poisoned" popup again, even though you are already poisoned.