That’s an interesting case of pica. For me, the bitter taste and awful smell would mean it’s not going near my mouth!
The toxic butt thing is not true, I brought it up just to state that tobacco itself can be a toxic plant.
We never did figure out what I needed, but I never stopped craving matches. I’m 43 and I still salivate when I see a burned match. The doctor wasn’t stunned, though. He was confident that the burned toast would work and it did help, though not cure, my cravings.