If you have the ProBundle version of AE, you can use the Particle generator to emit lots of small white particles. Adding a Gaussian blur on top of these gives quite a convincing smoke simulation.
I guess it depends on what you want to do with your smoke.
If you want smoke from a smoky torch, that's one thing, if you want smoke as in firefighters-struggling-to-find-each-other-in-the-smoke, that's a different thing.
For the latter, you might look at the cheat I used in
thread224-611516
"3d fog after effects"
I sometimes achieve good results using a blur on a particle playground, but not always. Smoke is like fire -- it either looks good or it looks bad.
Cheers,
Edward
"Cut a hole in the door. Hang a flap. Criminy, why didn't I think of this earlier?!" -- inventor of the cat door
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