Sorry there Nick, I didn't read Rock's post as closely as I should have. He had prefaced it with a note about smoker's who leave butts in the fire so I just skimmed it as I don't do that.
Then there was all the talk about litter, stereotyping, Baptists, and smokescreens such that well, that initial argument was in fact hidden behind a cloud of smoke for me. I just didn't have the discipline to read from the beginning again
.
Now all this talk is making me jones for a cigarette, but I don't start hiking until Thursday so I'll have to wait.
I think you have a reasonably good argument. I also agree, however, that ingestion could be harmfully toxic to some animals. As a Frolicking Dinosaur points explains, this toxicity is species dependent. Personally, I wouldn't bother arguing this case from the toxicity standpoint. The butts are litter and should be packed out.