Hi,
Yes, it's scheduled a short tutorial on this.
It's only a simple hdri+volume fog and tweaks in corona editor, nothing more. For the past two years I try to do as much as I can in 3d, this being a reason why I switched from Vray to Corona.
Only photoshop was to combine two different lightmix of the red lights and the rest of the lights all being WIP versions.
Fog, smoke, all 3D, using free vdb and corona fog.
Vdbs are a little less affected by environment, but they render pretty fast vs corona fog which is kind a slow and noisy when you wanna get extreme realistic results.
To be continued, the story is not over yet:D