The crossword solution for the term 'cigarette dropping' is 'ASH'. Cigarette dropping, also known as cigarette litter, is a form of environmental pollution caused by the improper disposal of cigarette butts. Cigarette butts are composed of cellulose acetate, a type of plastic, and contain toxic chemicals that can leach into the environment. Cigarette dropping is a major source of litter in many cities and towns, and can be hazardous to wildlife and aquatic life.