slowing down smoke

[Rif]

i dont recommend it but you can use a Wind with a Decay on..

This way you will fight some forces invertly .


but not a good thing ..


My best suggestion would be , replicate it like in Real life , smoke would rise and Temperature would Dissipate and diffuse , witch would create an Inversly Proportionnal to the Fluid life anti-boyancy behavior .. So Smoke will rize at proper speed , then slow down ..