Cigarette butts are by far Canada's leading form of litter. Worldwide, trillions are littered annually. Beyond being unsightly, non-biodegradable and toxic to marine and terrestrial life, they are costly to clean up, and a leading cause of both structure and forest fires. Although increasingly getting the attention that they deserve as an environmental concern, little thought has been given to them in the context of Canada's recently-proposed single-use plastics ban.