Any odors from the smoke?

I have had a couple of occurrences where a piece of trash blowing about on the street would attach to the hot catalytic converter or other exhaust component, and subsequently, melt or burn. Some would leave a residue that would have to be scraped off, while others burned off by itself.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car