Big scale smoke stacks help

[fabiomsilva]

hi thanks for the link.
however the tutorial doesnt explain how i can make the smoke dissipate as it life progresses into that nice kind of hazy smoke (dense at the beggining and hazy at the end) nor it explains how to slow down it as its life progresses(so not globally , as i want it to keep being fast as emitted but to slow it down as it floats up(drag)

i am trying to use the smoke dissipation density and strenght to get the smoke to die as it disperses but im getting sharp smoke instead of soft hazy one. any clue on how to get around this? Im also trying to dissipate or diffuse the temperature but doesnt seem to help much on this regard

thanks

Fabio