I use nHancer as well as SH4 Effects and I have no problems. I followed the instructions in the thread below and everything is rosy for me. I think the main point is that you should only set AA to Multisampling 4x, anything above causes the sun halo to vanish and may be the cause of your smoke woes. Anyway, here's the link:
http://www.subsim.com/radioroom/show...hlight=nhancer