Hmmmm...I've used the Jack Daniels Smoking Chips both in my beers and in food, and never gave it much thought...
I just went a googled them, because I thought they were oak barrels...
Jack Daniel's Tennessee Whiskey Wood Smoking Chips are made from 100% Jack Daniel's oak aging barrels. Jack Daniel's Tennessee Whiskey is aged in charred white oak barrels. During the aging process, the whiskey is drawn in and out of the wood giving it its distinctive color and flavor. A portion of whiskey remains in the wood after the barrels are emptied. Some of these barrels are made into Jack Daniel's Wood Smoking Chips. These smoking chips will add the distinctive flavor of Jack Daniel's Tennessee Whiskey to all your grilled foods! Use in charcoal, gas grills or smokers.
I can't really describe the flavor...It's like the above says, "distinctive" it's a cleanier, "woodier" flavor than mesquite or Hickory....
This is a good description of it from a What woods can I use to smoke with Faq.
It has a medium smoky flavor that is stronger than apple and cherry, but lighter than hickory. As a result, it mixes well with these three woods, but also works great by itself. It has a dense, tight grain and a color ranging from almost white to yellow to red.
The jack chips do impart a lightly sweet bourbon flavor to whatever I use them on/in.
Hope this helps...think clean smoke without the noticeable "tang" that comes from hickory or mesquite.