My first smoker was a Bradley. I used it for a few months and moved on. For those of you who aren't familiar with it—it's a low-powered electric oven with smoke eddying through it. Bradley smoked food never has a smoke ring (IDK why).
Bradley founder and CEO, Wade Bradley, sent this information to everyone on their mailing list. (I may have to get off of that list.)
"Why should you not want a Smoke Ring on your food?
"Have you heard of the SMOKE RING? That’s the red lining under the surface (bark) of meat that is being cooked with charcoal or wood as the heat source. The SMOKE RING has nothing to do with the smoke or flavor and is not created by smoke.
"It is a reaction of NO2 coming in contact with myoglobin, a protein found in meat. There is no flavor, and there is no benefit of seeing this ring of red in meat other than evidence that you and your family are ingesting high levels of Nitrogen Dioxide. [Emphasis mine.]
"It can be a high volume of NO2 when you are cooking your food using a enclose [sic] grill like a pellet grill, wood burning grill, or a Kamado grill."
So...He apparently thinks of himself as a medical expert.