Objects showing up in render I have a smoke domain showing up in my sampled render. I'm not sure if it will show up in rendered or is just in sampled.
As long as the camera button is un-clicked(as you have it now) It should not appear in a render, it will however be visible in the 3D view unless you un-click the button that looks like an eye. Also, because you're in cycles, you can just do a light render with like 10 samples and easily see a low quality image of what your creation looks like so far.