Ohhhh, it's just about tobacco. Ha ha!
Yeh, I have a jar like that too, where I dump the dregs from old tins and jars when there isn't enough for a full pipe full left. I also put cigar clippings in there. I've been doing it for years, and after cleaning up the cellar room, I had moved the unmarked jar. I grabbed it wondering what it was, because it was out of place, and smoked the whole thing. It wasn't bad, but I had wondered the whole time, "what is this blend?" It wasn't till I had almost finished the jar, and finished an open tin, and went looking for the jar that I realized...
Sometimes a random mix isn't all that bad. I think it's when you smoke a lot of aromatics and aros get mixed in that it becomes more awful, IMO. Just mixing a bunch of non-aros usually can never go wrong. IMO