Tuesday, June 16, 2015 at 2:55PM 
I was experimenting with creating smoke with Mir. It's basically two blurred layers of mir with slightly different settings. Added some dust with Particular too. It's not perfect but pretty cool. The comp was made so it can be extended to any duration (uses no keyframes, just time-based expressions).
Download project file (AE CS6 or later): MirSmoke_CS6.aep
Wednesday, March 4, 2015 at 8:04PM Download AE project file from here.
Note: I had to disable the Lens Flare layer on my computer since it didn't have the plug-in for that. Otherwise it'd just render grey.
It's a beautiful effect! And the project is neatly setup and renders quickly.
Sunday, December 7, 2014 at 5:40PM Fantastic results in this tutorial on creating snow with After Effects and Trapcode Particular.
Saturday, September 6, 2014 at 7:24PM Excellent tutorial by School of Motion. Covers a lot of useful techniques.