If they "survived the fire" then they probably dont die from oxygen depravation or at least not quickly.

To bee, or not to bee, that is the question:

Whether 'tis nobler in the mind to suffer

The stings and sparrows of outrageous fortune,

Or to take arms against a sea of troubles,

And by opposing end them: to die, to sleep

No more; and by a sleep, to say we end

The heart-ache, and the thousand natural shocks

That Flesh is heir to? 'Tis a consummation

Devoutly to be wished. To die, to sleep,

To sleep, perchance to Dream; aye, there's the buzz,

For in that sleep of death, what dreams may come,

When we have fluttered off this mortal coil,

Must give us pause.

Just let the old ticker get some time off.