Yeah, the dedicated image sites usually have great tutorials and advice for improvement.
I think that the greatest benefit of tuts is that they show you a method for approaching the problem. Once one gets the general idea, then the sky is the limit. Also, making smoke sucessfully gives one more confidence.
There are, quite literally, endless ways of depicting smoke. There's dark smoke, light smoke, opaque smoke and more transparent smoke. Which you choose depends upon the particular image you are working with.
Don't be hesitant to fool around with different ways of making smoke. You might be surprised with what you come up with on you own :!: :wink:
I've noticed that Rigmortiz uses quite a few different types of smoke in his images. You might want to look at some of his "smokey" images just to get an idea of how varied smoke can be.