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It's been noted on this board, and I've personally observed as well, that the car will smoke at startup if it wasn't warmed up on the previous run before being shut off. On my car, it hasn't smoked if the car was warmed up when I shut it off previously.
The MAF can't have anything to do with smoke at startup. The MAF is technically known as a hot-wire anemometer. It functions by monitoring the current through a wire at a known temperature and calculates an airflow based on a convection coefficient correlation. It requires that the anemometer is up to operating temperature, which it is not when you first crank the engine.
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