What did the smoke smell like? Oil, ATF and coolant all have their own distinct aroma and all could conceivably leak near the back of the engine, onto a hot exhaust, and produce large amounts of smoke. Power steering fluid can also produce large smoke if leaking onto a hot manifold, but I'm here to tell you power steering fluid on a hot exhaust manifold will produce almost instant flames, almost lost the Suburban that way one night.
I'd say let it sit over night and check all fluids and for any leak sources in the morning.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.