If it blows blue smoke when starting up, that is usually the valve guides need replacing. If it constantly blows blue smoke, you are looking at piston rings. Either way oil is getting into the combustion chamber. If it's valve guides, you need to have the heads looked at, if it is rings, the bottom of the engine needs to come out.
burning oil
Black and blue smoke means your engine is burning oil. That is bad. You may have a blown head gasket. That is very bad. You may have worn piston rings. That is also bad. I have no idea why your engine is burning oil but the reason is bad.
If you mean the smoke it's usually related to the quality of petrol
Smoke weed.
Blue smoke is oil burning. Loud noises in the engine means internal engine problems. Time for a complete overhaul of this engine.
White smoke means water, blue/black smoke means oil, black smoke can also mean the fuel mixture is too rich.
The piston rings in the motor are bad. Very expensive fix.
blue exhaust is usually due to excessive lubricating oil consumption and its emission indicates a very poor condition of the engine, such as worn out piston rings or valve guides, etc beside, as it possible to completely prevent the emission of blue smoke...
Unburnt fuel.
You may have oil on the exhaust, once this has burnt off the smoke should stop.
It could be coolant getting into the exhaust system which could mean that one or more of your car's gaskets are worn out and need repairs
of course it emits "smoke" you mean exhaust? it has to go somewhere, if it's a propeller plane it has an exhaust just like car, if it's a turbine, it has an exhaust outlet, if it's a jet engine, the exhaust is self explanatory