I think smoke vision is a limited version and only works with smoke effects, so an eversmoking bottle.
also could have burning torches that give off a lot of smoke.
mist and fog are not the same thing as smoke, and your red dragon cannot see through them any better than anyone else.
As GM you can create naturally smoky environment, such as nearby low level volcanic activity or wildfires - just adjust the CR to accommodate the favourable terrain.
Smoke obscures all vision, darkvision has no particular advantage unless it is also dark.
Second the volcanic area. Also, Reds aren't stupid and it makes sense that they would set up several eversmoking bottles to keep the advantage ever in its favor.
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Related question, then, how tall is the smoke cloud from an eversmoking bottle? 5'? 10'? It's certainly not a cube, smoke doesn't do that.
Eversmoking Bottle
Aura faint transmutation; CL 3rd
Slot none; Price 5,400 gp; Weight 1 lb.
Description
This metal urn is identical in appearance to an efreeti bottle, except that it does nothing but smoke. The amount of smoke is great if the stopper is pulled out, pouring from the bottle and totally obscuring vision across a 50-foot spread in 1 round. If the bottle is left unstoppered, the smoke billows out another 10 feet per round until it has covered a 100-foot radius. This area remains smoke-filled until the eversmoking bottle is stoppered.
Burst, Emanation, or Spread: Most spells that affect an area function as a burst, an emanation, or a spread. In each case, you select the spell's point of origin and measure its effect from that point.A burst spell affects whatever it catches in its area, including creatures that you can't see. It can't affect creatures with total cover from its point of origin (in other words, its effects don't extend around corners). The default shape for a burst effect is a sphere, but some burst spells are specifically described as cone-shaped. A burst's area defines how far from the point of origin the spell's effect extends.
An emanation spell functions like a burst spell, except that the effect continues to radiate from the point of origin for the duration of the spell. Most emanations are cones or spheres.
A spread spell extends out like a burst but can turn corners. You select the point of origin, and the spell spreads out a given distance in all directions. Figure the area the spell effect fills by taking into account any turns the spell effect takes.
So a 50 to 100 foot sphere.
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mist and fog are not the same thing as smoke, and your red dragon cannot see through them any better than anyone else.
Add a Smokestick as a material component to Obscuring Mist, and you get a smokey haze. Now the dragon can see thru it.
/cevah
Let's not discount the dragon possibly setting up stacks of kindling to use his breath weapon on. This not only will create the smoke but help the dragon control the battlefield by blocking off areas or seperating the pcs with "natural" firewalls.