1st off, I want say thanks for all the response and help, it is really appreciated... Im just really trying to work this out, smoke is an awesome effect Id like to incorporate into my imagery...

In the image, on the top left, I did indeed set the fog color to red (that was an awesome idea btw), w/ a density of 2 (maxed out I believe?!?) for maximum effect and visibility, all other settings are at their default... For the top right, I set the density back to default of 1...

For the bottom left, I tried "playing/experimenting" w/ the settings, still not the result Im trying to achieve. I also added another fog primitive, placed near the figures face to our right... Its at default settings, except for the shape of the fog primitive was switched to sphere...

The bottom right is actually an attemp at using Volumetric Clouds, and like you, I just dont see it... Mind you, the Volumentric Cloud Primitive bounding/size box was reduced from its original size of 12672.79x12672.79x6336.39in to a mere 120x120x16in (note the height is reduced non-uniformly when fitted to my scene) for easier "manipulation"..............

Ive tried many more times than just these 4 renders, but none of the settings w/ the fog give results I like... I can even say I dont like "fog" which seems to be just a layer of haze.... Im going for more of a smokey, toxic pollution air on the bottom of the surface of planet X-23 type look, if that makes any sense...

In the 1st fog example, you can see swirls and variation spread through the terrain. In the soupy tree, you can "see" the cloud, as in the third. Im just not getting anything to show =(

There are 3 kinds of people in the world. Those that can count, and those that can't..