From the box came a smoky, yellow vapor that licked lazily toward the man who viewed it.

There was a crash like a thousand windows all shattering together, and yellow vapor boiled up.

The yellow vapor was still swirling, and through it I saw the viewscreens.

On the far horizon was a conical mountain from which trailed wisps of yellow vapor.

Both men gagged as the yellow vapor rose around them.

The bags burst as they struck the ground, releasing yellow vapor that looked poisonous.

The Punics reeled back, afraid to let the yellow vapor overtake them.

There was a hum of motors within the casket, and after a few moments a yellow vapor began to fill the interior.

Open pits blew forth steam and clouds of yellow vapor.

A noxious yellow vapor began roiling into the cab by way of its ventilation system.