I offer you a couple of bits of info concerning cigarette butts, even though I have little interest in pursuing this much further. The point that "litter is litter" is valid, but to me, this obsession with butts is anal (pun intended)

First article describes the composition of filters.

"Most cigarette filters are made from cellulose acetate. Eastman Chemical Company and Hoechst Celanese Corporation are the leading suppliers of the material to cigarette companies."

Second article describes some other uses.

"Commercially, cellulose acetate is made from processed wood pulp. The pulp is processed using acetic anhydride to form acetate flake from which products are made.
Coming from wood pulp, means that unlike most man-made fibers, it comes from a renewable resource and is biodegradable.
Another technique for producing cellulose acetate involved treating cotton with acetic acid, using sulfuric acid as a catalyst………….

Other applications of cellulose acetate include:
· Wound dressings
· Personal hygiene products
· Absorbent cloths and wipes
· Specialty papers
· Filter media, including cigarette filters. Such materials are often referred to as “tow”."

Now does anyone care to investigate yarn?? :rolleyes:

I am now done with this.....well, almost. I just may be posting a picture shortly of a CIGARETTE-FILTER-caught steelhead. I will be giving it a shot, and I have no doubt that I can catch fish with them.......just for fun, you understand.