FACT: 4.5 Trillion cigarette butts are thrown on the ground or in bodies of water each year. There are 7 billion people in the world. That means that every person in the world would need to pick up 642 cigarette butts a year in order to rid the earth of cigarette litter.
SOURCE: Bonanomi, G., Incerti, G., Cesarano, G., Gaglione, S.A., & Lanzotti, V. (2015). Cigarette Butt Decomposition and Associated Chemical Changes Assessed by 13C CPMAS NMR. PLoS ONE, 10(1), e0117393.
SOURCE: Schlesinger, R. (2014, December 31). The 2015 U.S. and World Populations. U.S. News & World Report. Accessed 14 April, 2015.