Nick stopped the horse, and, half rising and bending forward, peered into the suffocating vapor.

Markest thou the smouldering and suffocating vapor which already eddies in sable folds through the chamber?

But it was rather curious that the boy and girl had endured more from the suffocating vapor than from the fire itself.

At my feet yawned a deep pit, from which, arose a suffocating vapor, so hot, it almost scorched my face and nearly stopped my breath.