"Natural Smoke Flavor" in Wendy's BBQ Sauce

i was reading the ingredients on the BBQ you get with the chicken strips at Wendy’s. it said it had “natural smoke flavor” in it. what exactly is that, and why is it listed as an actual ingredient?

Torula Yeast is a widely used flavoring ingredient used to impart a BBQ taste. I think the yeast is cured over hickory fire to get the flavor.

maybe the natural smoke flavoring is this stuff. I have another brand but it adds wonderful smoke flavor to barbecue cooked in a crock pot or such.

http://www.colgin.com/

From this site.

Yum yum.