Possibly the cleaner cleaned out a bunch of built up carbon and old oil. I wouldn't worry about it.
If you www the word "decarb" you will see that when cleaning out an engine with SeaFoam (brand engine cleaning product how to use tutorial) you will get a lot of smoke till the crud all gets loosened up and burned out. 2 cycle outboard engines with loop charging where the 2 per cylinder, wedge shaped rings have to move to seal off the combustion, the decarb process is priceless.
The info includes the caution that you shouldn't do this in your driveway as your neighbors won't appreciate being "smoked out".