Yes, i.e. Traeger Cherry pellets are not Cherry wood, but Cherry flavored oils added.I used some traeger pellets in a mailbox mod and after a short period of time dark liquid would seep through the air inlet holes in the bottom. I switched to lumberjack and the problem went away.
I have read in other places that traeger adds flavor to their pellets.
Been using Lumberjack for years but Rural king does not always offer them anymore and price almost doubled. What other brands use no filler woods and flavor oils?