Jonathan Lampel from BlenderHD shows how to tweak a few settings to have smoke simulations in Blender look like it is of a much larger scale, showing that a simple change in one setting can provide a significantly more real result.

Learn the secret to rendering realistic smoke in Blender!

Jonathan quickly goes through the process for creating the smoke simulation, and also provides a handy light cache comparison between various light cache settings and density scale settings. Check out the tutorial for Creating and Rendering Large Scale Smoke simulations in Blender here.