Back when I first started vaping I tried a couple of "tobacco" juices. I remember one of them was supposed to be the flavor of a Winston. Imagine a two thousand year old bus stop ashtray and you have a rough idea how bad it was. I actually had to throw out the tank because I could not get the smell of the stuff out of it.
Can't tell you how many times I have run into a flavor like that! Never had to toss a tank but has cost me a coil or two.