Well it won't be coming from the bonnet - from the engine compartment perhaps but not from the bonnet.
The exhaust system deals with the normal fumes so the smoke you see willl either come a leak in the exhaust system of from the burning of a spilled or leaking liquid or from a burning overheated wire or other component.
You really need to lift the bonnet and look to see the source of it.
Good luck...
Peccavi
March 2010