My car smoked a good amount right when I would start it up, but after about ~10 seconds it goes away, it definitely caused me some worry, so I had it brought into the local Subaru mechanic over here, and after some snoopin' around, we found it to be a valve problem. He easily got it fixed and all is good now.
So, I don't know if this helps or not, but the smoke you have, looked very similar to the smoke I had. Valves were the problem on my car soooo.... Maybe it's the valves? (just a guess...)