Is it the coating that's on all exhaust curing and burning off or is there actual smoke coming from the tailpipes? Converters can mask small oil burning problems such as valve stem seals or rings so if you have had a oil consumption problem at all there's your problem. On a previous car I burned a small amount of oil between oil changes but never saw any smoke from the tailpipes. When I moved to an off road h pipe the car smoked any time I got in the throttle at all which led to me finding a ring problem. How many miles on the car?