Well known non-issue or minor fix.
Occasional white smoke is normal, depends how engine internals happened to be positioned when it was last stopped..certain positions will create puff of white smoke for a few seconds at next start.
Now if you have it every start, and car does not seem to be running with usual smoothness or power, then it is likely MAF sensor or AOS needs replacing.
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2001 Boxster S, Seal Grey
1998 M3, Estoril Blue
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