Excessive smoke from exhaust 1997 Saturn?

When the smoke occurs helps give the answer. If you get it all the time, that usually means worn piston rings. That costs a lot to fix, but as long as you keep oil in your engine (tot the proper dipstick level), you can delay the repair for a while. Smoke that only occurs when you're decellerating means bad valve seals. That costs less to fix than rings, and can be delayed in th e same way. Hope this helps! Paul