So...
The campfire is not mobile (bad use of english.. so I apologize) but the fire is animated.
It wouldn't be a light source, just a sparkling animation like the fire at Laanx Temple... It can be seeing by far places.
You can't move fire, but you can move your camp

Smoke will use a large amount of processor...
Fire can be used to cook, to distil herbs (herbal skill), for alchemy, to baking, for glassbowing... a skill for making fire it can be used for many others...