First, check the engine oi level on the dipstick. If it is over full, smell it, does it smell like gasoline? Or maybe it is just over full from putting too much oil in, no big deal, Yet. Drain the oil completely. This engine takes about a quart and a half of oil.
Check the carburetor next, pull off the air filter and look into the air filter base to see if it is oily. If so the air filter will be wet too. What is happening is the oil is being "Pumped" up the breather hose into the carburetor and trying to burn it, causing the smoke.
When you lower the engine oil level this will stop. Run the tractor with the air filter off ( dont mow or drive), the breather hose should not have oil comming out of it anymore. The smoke will still be there for a while, so do it out side. The muffler will have oil that needs to cook out of it. When that stops you should be good.
If there is still "spitting" out of the breather, you may have bad piston rings alowing exaust to enter the oil sump. If this happens even after the oil level was checked, you need a rering job.
Hope this helps
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