[Responsibility2nd]

The filters are plastic. They do not biodegrade.

[Eric in the Ozarks]

Eventually, even plastic auto parts will biodegrade.

[jimt]

If I remember correctly, they’re fiberglass, or a close analogy.

And I’ve smoked Kool filter kings for 45 years.

Tossing your butts on the street, etc., is littering. I don’t do it, and I don’t like it.