I have white smoke coming out of my hood?

I have a 2001 Ford Taurus and I know that the white smoke indicates a coolant burn or leak but the thing is my coolant lvl has not dropped for a very long time and has stayed at the same level for a while I checked in the morning for spots under the car for a leak and there's none and the smoke is very little almost unseeable I can only see it when the head light is on and almost instantly goes away after the car is turned off it runs just fine I have been due for a tune up and oil change any ideas on what could be wrong?

I had a Ford Taurus once, I traded it in for a Honda Accord (used). When I returned to the car dealer just 2 days later there was another guy there trying to dump his Ford Taurus. It's a good car to get rid of, very problematic!

It may be a valve cover leaking oil onto the exhaust manifold. Small amounts of oil don't look blue when vaporized.

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