Tons of tutorials and plug ins on the Daz site for rendering haze, fog and volumetric lighting for Iray, has anybody had any success creating these effects for the Iclone plug in?

Intel Core i7-13700F - 32GB Memory - NVIDIA GeForce RTX 4070 TI. Iclone 8, Character Creator 4, Blender, Davinci Resolve studio, Fusion studio

I think I did a long time ago for haze. Came out alright. I just followed one of the DAZ tutorials you mentioned. May need to play with values in Iray materials for SSS, opacity etc. Can't remember.
But you may try to follow and experiment.