I don't smoke, but I think I have some information you all might like to here. I recently purchased an Uuni 2 pizza oven. Google it if you want to learn about it. Long story short, it burns wood pellets to create the ultra-high heat (800+ F) needed to make neapolitan style pizza's.
I'm a builder, so I spend a lot of time in my local Home Depot where I saw a 20 lb bag of Traeger Hickory pellets for $15. I have since learned this is not a great price. Oh well. Anyway, I fired up the Uuni 2 with these pellets for the first time and got very frustrated. It was not working as advertised. Not getting as hot as the creators advertised. Later, after some research, I found that Bear Mountain pellets have a reputation for burning hot. I bought these and the difference was like putting nitrous oxide in a car. ROARING FLAMES. I don't knock Traeger for their slow burning pellets. For a bbq, I'm sure low and slow is great.
I AM knocking them for the "Flavor Oils." The hopper for the Uuni 2 is not like a pellet BBQ. The pellets sit in a tub directly over the fire. As the fire burns down, they just fall down the hopper. The hopper has a scoop for filling it which sits on top of the tube. Besides just heat, it was a hugely different experience burning the Traeger pellets and the Bear Mountain pellets. The Bear Mountain pellets were a clean burn with a pleasant smoke smell. The Traeger pellets left a sticky, brown residue on the tube and the hopper scoop that I'm fairly certain will never come off. I'm certain of this because residue dripped onto my thumb while I was using the scoop. Four days later, I still haven't gotten this residue off. Two days later, it smelled like a mixture between liquid smoke you can buy at your grocery store and the smell on your clothes after camping a week.
My theory now is that the "Flavor Oils" are just liquid smoke. Not cool, Traeger.