We see them everywhere, cigarette butts littering the ground. Most people don’t even think about what those filters are made out of, so here we go. Most filters are made out of acetate cellulose, which is a plastic. As we all know by now, plastic doesn’t biodegrade or break down for hundreds of years, and even the broken down plastic, just turns into microplastic. So, up until recently, there has been no “cure” for cigarette butts.