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What mileage is your RCZ? Could be worn valve stem seals
Which oil do you use? If 0w30, try switching to 5w30 or even 5w40 and see if that helps. My old RCZ used to leave a lot of white smoke after stopping at red lights when using 0w30 oil. If I remember correctly, 5w30 helped a little.
Water vapor coming out of the exhaust for the first few minutes in winter is normal, water condenses inside the exhaust and then comes out when starting.
It is very different if smoke comes out when accelerating after having been idling stopped, already with the engine warm, at a traffic light, this indicates that there is oil consumption through the piston rings or in the intake valve seals.