So got my 2K4 WRX in to the shop to see if the white smoke was from failed turbo, blown head gasket, or bad cylinder. After a few nail biting hours later I called and asked for the verdict. None of that was found! Everything was in excellent working order! It was suggested that it was built up condensation in the exhaust. That made since because it was very hot and humid that day then cooled down quite a bit. And the smoke had no sweet or acrid smell. Just smoke that went away. Hope this may help anyone else that experiences this but always get it checked out.