My theory is that as long as you don't choke to death in the gas and escape, you'd be fine. CJ's side of
the tower, first noted that their convoys found the zone was harder to breathe. I suppose couple of their guys were exposed to it as well. (correct me if I'm wrong... its been so long.)
And when the gasses came up, I guess that majority of the people choked to death and came back alive, it was probably heavier too when the gasses broke out.
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