What is the SMOKE setting on an AC grill, and how does it differ from simply "smoking" your food?
The SMOKE setting is specific to AC (non-WiFIRE-enabled) grills, and sets the grill to 160º F.
Smoking is the process of flavoring, cooking, or preserving food by exposing it to smoke from burning material -- in Traeger's case, wood pellets.
Technically speaking, no matter what temperature you set your grill, you will always be smoking your food, as this is how Traeger grills produces heat and cook food. That said, setting your grill between 160º and 225º F will produce the largest amount of smoke, and is thus where we traditionally consider food smoked.