If you have smoke when you start the car or when the car idles for a long time and then accelerates with smoke, then it could be that the valves need "valve stem seals". It is possible to repair it without complete tear down of the motor. It is no easy task to add or replace these seals. It requires removal of the camshaft and the use of a spring compression tool.

It could be more severe and you need to take the car to a mechanic to have a "compression test". This will determine if you have bad piston rings or a damaged valve.