sorry i forgot to say, that to use it for animating, you could adjust the settings of your nodes, that you could attach to the prop!! and at keyframe positions, you could adjust the node settings again and so on throughout your anim, might work anyway,

 other than that i would think the only way to simulate an animated fog, would be to adjust the atmosphere settings(dust and fog nodes) throughout the anim, but this way would need more work with lighting adjustment also.for atmos and volumetric lighting to work you sort of need a wall or equivelant at the back of the scene.adjustment to atmos and volumetrics throughout the anim should give the illusion of fog or smoke movement.