Nice Work Iambecome but i saw there some problems.
Small Fire uses the same Smoketexture.
I created this Smoke in a new way.
Only the smoke from Big Fire is affected and this smoke was generated with 3 Textures.
Here is my work.
With this kind of Smokegeneration you will also see the fireshining at the smoke´s base and the smoke disappears better and in a very fine way in the athmosphere.
Regards
Maddy