It could be a few things. Its over heating and the fuel is burning up,you could be using the wrong fuel or if it has been doing it form the start(when you bout it) then it's fine or change the fuel your using.
white smoke almost always means your lawnmower is burning oil. this could mean either your piston rings are worn and need to be replace ( can be done easily if you have the tools) or you have too much oil in the motor.
You have a bit of extra oil in the cylinder burning off for some reason
If its black smoke you are burning oil possibly due to oil getting in your exhaust by tilting the lawnmower on its side or your rings are allowing oil by.
the engine is flooded with gas
White smoke coming from your tail pipe often indicates an issue with your coolant. The smoke comes from burning coolant. The engine sputters and white smoke is likely an issue with the head gasket.
what does it mean when your refrigerator threw white smoke from the front of the freezer?
It depends from where it emitting it. White smoke could be steam if from the front - check radiator White smoke from underneath could be transmission fluid White somke from tailpipe could mean burning oil.
water
White smoke means a new Pope has been chosen. Black mean one has not been chosen.
Does it smell sweet? If so, you're probably leaking coolant, but could be due to any number of things.
White smoke means water, blue/black smoke means oil, black smoke can also mean the fuel mixture is too rich.
Usually the engine is burning coolant.