I’ve been using particles to try and fake smoke for a while now (there’s a thread around here somewhere) and frankly, i think i’m pretty damn close.
some things that would make my life easer are: rnd life (i believe this was made to randomize particle lifespan before the update)
and multiple particle systems on one object. I know that i could just duplicate an object, but this makes for far cleaner and easier to navigte scenes.