smoke in cycles through scenes and layers.

I want to make a short little film in cycles. But it has smoke in it. Is there a way to somehow use scenes and layers to do implement both in?

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I dont think you could use both renderers at the same time but you could probably render an internal animation and composite it over a cycles animation. only question would be how to get the smoke out on a transparent background.
I literally my first nodes yesterday, so perhaps trans png sequence, vid that supports transparency if such a thing exists or render on green bg and key the green out. which i tried but couldnt quite do yesterday. but an expert probably could.