Mr, I see you corrected scale, thanks!
I recommend to make change:
If smoke objects > 1 ????
smokePath = os.path.join(previewDir, "smoke_%s.df3"%povName)
Also
smoke_type == 'COLLISION' has to be visible
I would write so:
        renderEmitter = True
        for mod in ob.modifiers:
            if mod and hasattr(mod, 'smoke_type'):
                if (mod.smoke_type == 'DOMAIN'):
                    exportSmoke(ob.name)
                    renderEmitter = False
                break

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