So, I'm trying to animate some war sequences, but I can't find any poser smoke for when the guns fire (blood either, but that's another issue). I'd use Photoshop and some of the smoke brushes for that, but I'm wanting to animate, and that's done as a video file, which Photoshop can't mess with.

What can I do?

You might check out Nerd3d's "Smoke and Flames Tool" at DAZ

http://www.daz3d.com/i/shop/itemdetails/?item=10951 

there is a video of it capability on that page

It's always a good idea to save your animation out as a sequence of frames. Not only will this let you post work the frames more easily, but if the render get's interupted (power failure, computer crash, Poser failure, etc...) you can pick up the render from the frame it left off on and wont lose the entire sequence.

The smoke and flames tool Medzinatar recomended is great, as is that same author's Dust and Trails tool as well as the Spray Tool.  Metaform used to be great for water and liquid effects, but only works in Poser 4-6.  You could try using Particles 3 available at Daz3D for smoke, fire, and other effects.

Another route is to use real smoke and flames. If you don't mind doing it post, check out Detonation Films dot com. They have a lot of free stuff that is already chroma keyed and works pretty good.

Don't forget Partical Illusion.

Woot. Thank you.