Valve stems are white, grayish smoke.There is a puff of smoke after idling. Not a great deal of volume and only for a brief moment or two. I'd call it not extremely white, some gray in it. Definitely not blue.
I would say that is primary cause in your case. Go thicker oils, European oils that you can readily get in Wal Mart: Quaker State 5W40, Valvoline European Vehicle 5W40, Castrol Edge 5W40 and oils I recommend earlier if available. See if consumption reduces to acceptable levels. Valve stems might not be worth doing, so try to mitigate it.