You'll have to get under the car and see what's leaking/burning.
It could be a lot of things, oil,
tranny fluid, power steering fluid...
It doesn't take much of any of them to make a lot of smoke when they hit hot exhaust pipes and/or catalytic converters.
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1976 Ford Mustang II Ghia: 302 with a 600cfm Edelbrock carb, Edelbrock Performer 289 intake, Dynomax Blackjack headers, 2.5" exhaust with Flowmaster Super 44s. RJS 11-gallon fuel cell, C4
tranny, chrome 16" pony wheels, fuzzy dice, brown vinyl half-top, and painted in the tackiest color ever (harvest gold, that's why I call it "The Goldenrod").
Also have a 2003 Dodge Ram (lightly modded daily driver/tow rig/office/dining room/home away from home/workshop... I call it "The Big Blue Dawg".)
seeing smoke is alwase a big problem 
