The white smoke is usually water, but there is a lot of water in the air in Washington State and that might go away because an engine is really a big air compressor pulling in moisture,
Burning gasoline also produces water. Because the combustion process also burns a lot of oxygen, each gallon of gasoline produces roughly a gallon of water! (In addition to not quite a cubic foot of CO2.)
Usually, you can't see it, as it comes out still in invisible vapor form. But if your exhaust is cool, some of the vapor can condense to liquid water.
Look around on a cold morning, it's not at all unusual to see a car with water running out the tailpipe.
PS, I don't mean to reopen the debate; but I was taught that the only way to get an accurate torque reading is with the fastener still moving. If you stop and restart near the final torque value, you will get an inaccurate (too high) reading because of the "stiction" (static friction) effect that John mentioned. So I have always loosened each nut a bit, then turned back to the correct torque before going on to the next nut in the sequence. I've certainly had head gasket failures; but I don't believe any of them were from improper retorque procedure.
I did learn, the hard way, that it's important to check liner protrusion on both sides; never had a head gasket failure (with one I installed) since then.