Cigarette butts are commonly disposed of in water ways and on pavements. The filter is made of high degree of substitution (DS) CA fibre. An early report erroneously identified cellulose acetate as non-biodegradable , without extensive work on the topic. A more recent review has reiterated the clear decrease in biodegradability of CAs, as DS increases, based on a combination of the key literature studies. Drawn from an existing body of research dedicated to understanding all aspects of CA's biodegradation , it is also important to highlight that previous work even indicates that high DS CA, close to cellulose triacetate (CTA), is actually biodegradable over longer time periods -recent studies show this is possible even under seawater conditions (Eronen-Rasimus et al 2022). Therefore, more needs to be done, as soon as possible, to guide the best courses of action for updating related legislation.