Installed Denso o2, now I get smoke out exhaust

[MistaScott]

I installed a Denso o2 in my 87 LeSabre because the old one may very well have come with the car from the factory.

I reset the ECM, and start up and the engine runs fine but I see this smoke coming out of the exhaust that looks whitish/gray. What is going on here? Anti-seize burning off?

 

[MistaScott]

The smoke is gone

It appears whatever it was burnt off. Maybe condensation?