Which engine do you have 1.6L or 1.8L? You can verify its oil coming from the valve cover by simply unplugging the line going into the valve cover. Put a bolt or something equally thick into the hose and tighten down the hose clamp. This will keep the intake from sucking in unmetered air. It wont hurt the engine to not pull vacuum on the valve cover, but some oil will spurt out of the valve a little. Then see if the engine still smokes.
I would also start checking the oil dip stick every couple hundred miles to see what your oil consumption is. The 1.8L MR18DE engine only has a 3 quart oil pan so you can burn through it quicker then you think. If your still burning oil after you disconnected the PCV line from the intake I would look at inspecting the spark plugs. You have to remove the intake manifold on the 1.8L (I have no experience with a 1.6L) so it requires some effort. Several people, including myself, have had the 1.8L go bad....particularly cylinder #3. #3 will be the 3rd cylinder (spark plug) from the timing chain side (timing chain is on passanger side). See if that is dirtier then the others. Not to put fear in you, but it is a somewhat common issue with the MR18 (see my signature). If you have the 1.6L HR16 engine then someone else with experience with that can chime in
