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How long did you run the truck? Did it quit after warming up? If so, it might have been condensation built up in the exhaust. Mine does this after sitting a day or so. It is normal.
A small amount of brake fliud would burn off rather quickly, if it did get into the vacuum line. Take the line off the booster and plug it. If the smoke quits, change the booster, and check the rear of the master cylinder, it should be dry. If it's wet, change it too.
For fluid to get into the booster, you would have a very noticible vacuum leak. The engine would idle rough, and the brakes would have a hard petal.
If it continues smoking, keep an eye on the temp guage. You may have an internal crack, or a bad head gasket.
Good Luck
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