Don't know if Laminar has toned down their “Particle Effect” in the latest update, since some had commented that the effect was a bit “exaggerated” in 11.30. If you know how to use the PlaneMaker.exe app, you can check whether the "vapor" feature is enabled on any particular aircraft. The feature is managed under the following section for each airplane...
Drop-down menu: Expert | Invisible Parts.
At the bottom section, check “Use X-Plane's built-in wing heat effects”.