<snip>
>
> Many times the "Smokey flavor" comes from the fat in the meat
> dripping on the grill and producing smoke. Many restaurants have
> gas fired grills that allow the dripping fat to be burned
> imparting a Smokey flavor to the meat. This flavor or amount of
> flavor is in direct proportion to the fat content of the ground
> beef ( usually from 7 to 20%) depending on the specifications of
> the restaurant.
>
> Dimitri

Yep, and smoke from dripping fat is one of the strongest carcinogens
there is.
Bob-tx