Shanshan Yang
Chenting Gu
Qiying Yang- 1Institute for Advanced Marine Research, China University of Geosciences, Guangzhou, China
- 2College of Marine Science and Technology, China University of Geosciences, Wuhan, China
Introduction
Cigarette butts (CBs) waste is pervasive in the environment and can be found in various locations, including oceans (Belzagui et al., 2021), beaches (Araujo and Costa, 2019), parks (Ribeiro et al., 2022), rivers (Shen et al., 2021), sediments (Consoli et al., 2020), soils (Gill et al., 2018) and even inside animals (Novotny et al., 2011). It is estimated that approximately 1.2 million tons of CBs have been discarded into the environment worldwide, and this number is expected to increase by 50% by 2025 (Torkashvand et al., 2021). This will result in adverse effects on all levels of biological systems (Soleimani et al., 2022a; Dobaradaran et al., 2021a).
Global cigarette consumption without sufficient waste management constitutes a toxic plastic world for humanity (Beutel et al., 2021). Based on the trends in cigarette production, the entry of CBs into the environment, the adverse impacts on Earth system processes, and inadequate monitoring and safety assessments, CBs have become the second-highest form of plastic pollution worldwide, poisoning our planet (Torkashvand et al., 2021; Soleimani et al., 2022a; Lima et al., 2021). Although scientists and environmental organizations are working to establish general outlines and launch campaigns to end the global problem of CBs littering, the issue has become increasingly prevalent in recent years. Research has found that CBs were the second most prevalent plastic item (5.14%) discovered on the Mediterranean seabed at depths below 30 meters (Consoli et al., 2020). Today, the contribution of CBs to the global biodiversity crisis and microplastic pollution is poorly understood (Belzagui et al., 2021). We should focus on the potential impact of CBs pollution on the toxicity of biological populations and ultimately, how it affects the ecosystem. This article aims to elucidate the common causes of CBs pollution and discuss the physical and chemical pollution caused by CBs, particularly in the marine environment. The potential social burden of CBs pollution was also discussed. Finally, key environmental perspectives on the research and management of CBs pollution were proposed.
Social behavior: a key contributor to increased CBs waste
Cigarette smoking is widely regarded as a prevalent social behavior. Despite extensive health awareness campaigns, the global number of smokers remains alarmingly high, reaching 1.14 billion in 2019 (Collaborators, 2021). Additionally, over 6 trillion cigarettes are manufactured worldwide annually, with projections from the World Health Organization indicating that production is anticipated to reach 9 trillion by 2025 (Novotny and Slaughter, 2014; Zafeiridou et al., 2018; Beutel et al., 2021). However, due to the lack of management guidelines, 75% of smokers casually discard their CBs, leading to a visible increase in the abundance of CBs waste, which accounts for 38% of the total waste generated (Initiative, 2017; Rahman et al., 2020).
The discarded CBs can be carried by surface runoff and eventually enter waterways and oceans (Pauly et al., 2002; Novotny et al., 2009; Conradi and Sanchez-Moyano, 2022). Reports from the Ocean Conservancy reveal that CBs rank first in terms of abundance among the garbage collected annually on beaches, docks, and ports worldwide (Ocean Conservancy, 2021).
Ecological risks of CBs
CBs pollution is a unique environmental challenge as it poses not only persistent and ubiquitous chemical contamination with highly toxic substances but also physical contamination as a form of plastic pollution (Conradi and Sanchez-Moyano, 2022). CBs have been officially classified as hazardous waste in accordance with European conventions and have emerged as one of the most critical and concerning global waste issues (Rebischung et al., 2018).
Nearly 7000 chemical substances (such as heavy metals, nicotine, PAHs, etc.) can be leaked from CBs into the aquatic environment, and more than 40 of these substances are mutagenic or carcinogenic, making them harmful to aquatic organisms (Figure 1) (Slaughter et al., 2011; Soleimani et al., 2022a; Dobaradaran et al., 2021a). For instance, aromatic amines (AAs), also known as potential bladder carcinogens, are in significantly higher concentrations in freshly smoked CBs than in aged CBs (Dobaradaran et al., 2022). Additionally, the leaching levels of potentially toxic elements (PTEs), BTEX, and PAHs from CBs vary in different water environments, exerting both short-term and long-term impacts on marine and freshwater organisms (Dobaradaran et al., 2018; Akhbarizadeh et al., 2021; Dobaradaran et al., 2020; Dobaradaran et al., 2021b; Dobaradaran et al., 2022; Dobaradaran et al., 2023). According to published studies, over 70% of ecotoxicological studies have focused on the chemical components of CBs, using extracted leachate to evaluate the ecological risk on different organisms, such as bacteria, gastropods, polychaetes, and oysters. The majority of these studies have suggested toxic effects on these organisms in terms of physiological responses and behavior, including changes in growth, reproduction, hematologic markers, and other factors (Conradi and Sanchez-Moyano, 2022; Green et al., 2022; Soleimani et al., 2023; Soleimani et al., 2022b; Dobaradaran et al., 2021a). However, the results are heterogeneous, and it is difficult to determine the leakage ability and bioavailability of toxic substances present in CBs due to differing experimental set-ups (Conradi and Sanchez-Moyano, 2022). Despite this, there is no denying that CBs waste releases harmful toxins into the ecosystem. It is estimated that annually worldwide, CBs contribute to the release of approximately 5.0 tons of ΣPAH, 2.9 tons of ΣPAAs, 4.2 tons of naphthalene, and 0.9 tons of acenaphthene (Dobaradaran et al., 2019; Dobaradaran et al., 2022).
Figure 1 Schematic diagram of the environmental risks and management of CBs.
Due to their plastic properties, CBs-derived plastics constitute about 4%-10% of the plastics released into the ocean environment annually (Belzagui et al., 2021). As they are non-biodegradable and have a low decomposition rate in seawater (Bonanomi et al., 2020), approximately 100 microfibers (<0.2 mm) can be released from CBs per day, which can persist for up to 30 years (Piccardo et al., 2021). Research has shown that microplastics from plastic bottles and other common plastic materials can enter various trophic levels through the food chain. In the marine environment, plastic ingestion can cause suffocation, mobility restriction, intestinal blockage, and other issues affecting hundreds of species worldwide, including marine mammals, seabirds, and sea turtles (Diana et al., 2022). The accumulation and transfer of microplastics within the food web can increase the mortality rate of organisms, thereby threatening ecological balance and biodiversity. Microplastic fibers account for 43.9%-93% of microplastic particles in zooplankton, fish, and shrimp (Akhbarizadeh et al., 2020; Lin et al., 2022). However, the ecological effects of microplastics derived from CBs remain uncertain (Caridi et al., 2020). Only a few studies have shown that the presence of microplastic fibers in the leachate of CBs can increase the mortality rate of Daphnia magna, with the lethal concentration decreasing from 0.89 CBs/L to 0.62 CBs/L, and the toxicity of the leachate can increase fourfold under low CBs concentration (Belzagui et al., 2021). However, most experiments on leachate and microplastics have been conducted in a laboratory setting and for a short duration, lacking long-term and in-situ simulation experiments in the marine environment. Given the unique and complex nature of CBs, more extensive and realistic simulation studies are needed.
As an important carrier of dangerous substances, CBs can absorb toxins during their transfer and pollute even more remote ocean environments. Research has shown that the presence of CBs in the sea can lead to an almost two-fold increase in heavy metal concentrations after 10 days and up to 200 times the original levels after 85 days in a contaminated ocean environment (Dobaradaran et al., 2017; Santos-Echeandía et al., 2021). The desorption kinetics are related to the degradation status of the CBs, and greater absorption occurs in highly degraded CBs (Santos-Echeandía et al., 2021). However, this is often overlooked in current studies. Thus, the degree of degradation of CBs should be considered during investigations.
The societal burden of CBs pollution: human health and resource waste
Microplastics have been detected in human blood, intestines, and other tissues, and their impact on human health extends across various levels of biological organization (Lim, 2021; Morrison et al., 2022). These impacts range from molecular and cellular processes to organ systems, potentially affecting physiological responses (Diana et al., 2022). Given the widespread presence and complexity of CBs, the chemicals and microplastics derived from CBs are also inevitably entering the human body through the water cycle or food chain. The harmful effects of these substances on human health may be even greater than those of microplastics from other sources. However, the impact of microplastics derived from CBs on human health is currently unknown, and research in this area is urgently needed.
Littering and improper waste disposal, including the improper disposal of CBs, reduces environmental quality and cleanliness, resulting in losses in the tourism industry and leading to higher cleaning costs and rare but costly issues (Araújo and Costa, 2019). For instance, if a beach is dirty and messy, tourists may reduce their stay by 60%, and their satisfaction levels will also significantly decrease (Esparon et al., 2015). Therefore, beach cleaning is necessary, with estimated costs ranging from 13,000 to 80,000 euros per kilometer of coastline (Conradi and Sanchez-Moyano, 2022). Additionally, the toxic substances released by CBs will impact the food chain, reducing fishing volume and other activities and causing economic losses in the fishing industry (Conradi and Sanchez-Moyano, 2022). In summary, CBs pollution results in the wastage of resources such as workforce and finances.
Conclusion
The increased waste of CBs in the environment has led to abundant pollutants and microplastics in the water environment. Existing research shows that the ecological risks, social burden, and resource wastage caused by CBs cannot be ignored. To effectively evaluate the ecological risks of CBs, the following suggestions are proposed: 1) Conduct long-term and in-situ simulation experiments in the marine environment to accurately assess the chemical and physical pollution caused by the degradation of different brands of CBs in the environment; 2) Establish scientific research methods and indicators to make different CBs studies comparable to each other; 3) Investigate the impact of CBs on biological populations, species diversity, and ecosystem functionality; 4) Pay attention to potential health risks to humans caused by CBs pollution. In order to reduce CBs pollution, the following measures could be taken: i) Conduct widespread education campaigns on the proper handling of CBs; ii) Enforce strict legislation to punish the littering behavior of CBs; iii) Encourage companies to use non-toxic, biodegradable materials for cigarette filters through policy subsidies and other forms of incentives.
Author contributions
SY: Conceptualization, Funding acquisition, Investigation, Project administration, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing. CG: Validation, Visualization, Writing – review & editing. QY: Conceptualization, Investigation, Project administration, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing.
Funding
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by the National Natural Science Foundation of China (42206113), National Postdoctoral Program for Innovative Talents (BX20220278) and China Postdoctoral Science Foundation (2022M710136).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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References
Akhbarizadeh R., Dobaradaran S., Nabipour I., Tajbakhsh S., Darabi A. H., Spitz J. (2020). Abundance, composition, and potential intake of microplastics in canned fish. Mar. pollut. Bull. 160, 111633. doi: 10.1016/j.marpolbul.2020.111633
Akhbarizadeh R., Dobaradaran S., Parhizgar G., Schmidt T. C., Mallaki R. (2021). Potentially toxic elements leachates from cigarette butts into different types of water: A threat for aquatic environments and ecosystems? Environ. Res. 202, 111706. doi: 10.1016/j.envres.2021.111706
Araujo M. C. B., Costa M. F. (2019). A critical review of the issue of cigarette butt pollution in coastal environments. Environ. Res. 172, 137–149. doi: 10.1016/j.envres.2019.02.005
Araújo M. C. B., Costa M. F. (2019). From plant to waste: the long and diverse impact chain caused by tobacco smoking. Int. J. Environ. Res. Public Health 16 (15), 26905. doi: 10.3390/ijerph16152690
Belzagui F., Buscio V., Gutierrez-Bouzan C., Vilaseca M. (2021). Cigarette butts as a microfiber source with a microplastic level of concern. Sci. Total Environ. 762, 144165. doi: 10.1016/j.scitotenv.2020.144165
Beutel M. W., Harmon T. C., Novotny T. E., Mock J., Gilmore M. E., Hart S. C., et al. (2021). A review of environmental pollution from the use and disposal of cigarettes and electronic cigarettes: contaminants, sources, and impacts. Sustainability 13 (23), 12994. doi: 10.3390/su132312994
Bonanomi G., Maisto G., De Marco A., Cesarano G., Zotti M., Mazzei P., et al. (2020). The fate of cigarette butts in different environments: Decay rate, chemical changes and ecotoxicity revealed by a 5-years decomposition experiment. Environ. pollut. 261, 114108. doi: 10.1016/j.envpol.2020.114108
Caridi F., Sabbatini A., Birarda G., Costanzi E., De Giudici G., Galeazzi R., et al. (2020). Cigarette butts, a threat for marine environments: Lessons from benthic foraminifera (Protista). Mar. Environ. Res. 162, 105150. doi: 10.1016/j.marenvres.2020.105150
Collaborators, G. B. D. Tobacco (2021). Spatial, temporal, and demographic patterns in prevalence of smoking tobacco use and attributable disease burden in 204 countries and territories 1990-2019: a systematic analysis from the Global Burden of Disease Study 2019. Lancet 397 (10292), 2337–23605. doi: 10.1016/S0140-6736(21)01169-7
Conradi M., Sanchez-Moyano J. E. (2022). Toward a sustainable circular economy for cigarette butts, the most common waste worldwide on the coast. Sci. Total Environ. 847, 157634. doi: 10.1016/j.scitotenv.2022.157634
Consoli P., Sinopoli M., Deidun A., Canese S., Berti C., Andaloro F., et al. (2020). The impact of marine litter from fish aggregation devices on vulnerable marine benthic habitats of the central Mediterranean Sea. Mar. pollut. Bull. 152, 110928. doi: 10.1016/j.marpolbul.2020.110928
Diana Z., Karasik R., Merrill G. B., Morrison M., Corcoran K. A., Vermeer D., et al. (2022). A transdisciplinary approach to reducing global plastic pollution. Front. Mar. Sci. 9. doi: 10.3389/fmars.2022.1032381
Dobaradaran S., Mutke X. A. M., Schmidt T. C., Swiderski P., De-la-Torre G. E., Jochmann M. A. (2022). Aromatic amines contents of cigarette butts: Fresh and aged cigarette butts vs unsmoked cigarette. Chemosphere 301, 134735. doi: 10.1016/j.chemosphere.2022.134735
Dobaradaran S., Nabipour I., Saeedi R., Ostovar A., Khorsand M., Khajeahmadi N., et al. (2017). Association of metals (Cd, Fe, As, Ni, Cu, Zn and Mn) with cigarette butts in northern part of the Persian Gulf. Tob. Control 26 (4), 461–463. doi: 10.1136/tobaccocontrol-2016-052931
Dobaradaran S., Schmidt T. C., Kaziur-Cegla W., Jochmann M. A. (2021b). BTEX compounds leachates from cigarette butts into water environment: A primary study. Environ. pollut. 269, 116185. doi: 10.1016/j.envpol.2020.116185
Dobaradaran S., Schmidt T. C., Lorenzo-Parodi N., Jochmann M. A., Nabipour I., Raeisi A., et al. (2019). Cigarette butts: An overlooked source of PAHs in the environment? Environ. pollut. 249, 932–939. doi: 10.1016/j.envpol.2019.03.097
Dobaradaran S., Schmidt T. C., Lorenzo-Parodi N., Kaziur-Cegla W., Jochmann M. A., Nabipour I., et al. (2020). Polycyclic aromatic hydrocarbons (PAHs) leachates from cigarette butts into water. Environ. pollut. 259, 113916. doi: 10.1016/j.envpol.2020.113916
Dobaradaran S., Schmidt T. C., Mutke X. A. M., De-la-Torre G. E., Telgheder U., Kerpen K., et al. (2023). Aromatic amines leachate from cigarette butts into aquatic environments: Is there risk for water organisms? Environ. Res. 216 (Pt 3), 114717. doi: 10.1016/j.envres.2022.114717
Dobaradaran S., Schmidt T. C., Nabipour I., Ostovar A., Raeisi A., Saeedi R., et al. (2018). Cigarette butts abundance and association of mercury and lead along the Persian Gulf beach: an initial investigation. Environ. Sci. pollut. Res. Int. 25 (6), 5465–5473. doi: 10.1007/s11356-017-0676-9
Dobaradaran S., Soleimani F., Akhbarizadeh R., Schmidt T. C., Marzban M., BasirianJahromi R. (2021a). Environmental fate of cigarette butts and their toxicity in aquatic organisms: A comprehensive systematic review. Environ. Res. 195, 110881. doi: 10.1016/j.envres.2021.110881
Esparon M., Stoeckl N., Farr M., Larson S. (2015). The significance of environmental values for destination competitiveness and sustainable tourism strategy making: insights from Australia’s Great Barrier Reef World Heritage Area. J. Sustain. Tourism 23 (5), 706–7255. doi: 10.1080/09669582.2014.998678
Gill H., Rogers K., Rehman B., Moynihan J., Bergey E. A. (2018). Cigarette butts may have low toxicity to soil-dwelling invertebrates: Evidence from a land snail. Sci. Total Environ. 628, 556–561. doi: 10.1016/j.scitotenv.2018.02.080
Green D. S., Tongue A. D. W., Boots B. (2022). The ecological impacts of discarded cigarette butts. Trends Ecol. Evol. 37 (2), 183–1925. doi: 10.1016/j.tree.2021.10.001
Initiative T. (2017). 5 ways cigarette litter impacts the environment. Available at: https://truthinitiative.org/research-resources/harmful-effects-tobacco/5-ways-cigarette-litter-impacts-environment.
Lim X. (2021). Microplastics are everywhere — but are they harmful. Nature 593, 22–25. doi: 10.1038/d41586-021-01143-3
Lima C., Amaral Dos Santos Pinto M., Brasil Choueri R., Buruaem Moreira L., Braga Castro I. (2021). Occurrence, characterization, partition, and toxicity of cigarette butts in a highly urbanized coastal area. Waste Manag. 131, 10–19. doi: 10.1016/j.wasman.2021.05.029
Lin L., Chen C. C., Zhu X., Pan K., Xu X. (2022). Risk of aquaculture-derived microplastics in aquaculture areas: An overlooked issue or a non-issue? Front. Mar. Sci. 9. doi: 10.3389/fmars.2022.923471
Morrison M., Trevisan R., Ranasinghe P., Merrill G. B., Santos J., Hong A., et al. (2022). A growing crisis for One Health: Impacts of plastic pollution across layers of biological function. Front. Mar. Sci. 9. doi: 10.3389/fmars.2022.980705
Novotny T. E., Hardin S. N., Hovda L. R., Novotny D. J., McLean M. K., Khan S. (2011). Tobacco and cigarette butt consumption in humans and animals. Tob. Control 20 Suppl 1 (Suppl_1), i17–i20. doi: 10.1136/tc.2011.043489
Novotny T. E., Lum K., Smith E., Wang V., Barnes R. (2009). Cigarettes butts and the case for an environmental policy on hazardous cigarette waste. Int. J. Environ. Res. Public Health 6 (5), 1691–1705. doi: 10.3390/ijerph6051691
Novotny T. E., Slaughter E. (2014). Tobacco product waste: an environmental approach to reduce tobacco consumption. Curr. Environ. Health Rep. 1 (3), 208–216. doi: 10.1007/s40572-014-0016-x
Ocean Conservancy (2021) Ocean conservation. Pandemic pollution: the rising tide of plastic PPE. Available at: https://oceanconservancy.org/wp-content/uploads/2021/03/FINAL-Ocean-Conservancy-PPE-Report-March-2021.pdf.
Pauly J. L., Mepani A. B., Lesses J. D., Cummings K. M., Streck R. J. (2002). Cigarettes with defective filters marketed for 40 years: what Philip Morris never told smokers. Tob. Control 11 Suppl 1 (Suppl 1), I51–I61. doi: 10.1136/tc.11.suppl_1.i51
Piccardo M., Provenza F., Anselmi S., Broccoli A., Terlizzi A., Renzi M. (2021). Use of Sediqualsoft® to determine the toxicity of cigarette butts to marine species: A weather simulation test. J. Mar. Sci. Eng. 9 (7), 734. doi: 10.3390/jmse9070734
Rahman M. T., Mohajerani A., Giustozzi F., Giustozzi F. (2020). Possible recycling of cigarette butts as fiber modifier in bitumen for asphalt concrete. Mater. (Basel) 13 (3), 734. doi: 10.3390/ma13030734
Rebischung F., Chabot L., Biaudet H., Pandard P. (2018). Cigarette butts: A small but hazardous waste, according to European regulation. Waste Manag. 82, 9–14. doi: 10.1016/j.wasman.2018.09.038
Ribeiro V. V., Lopes T. C., Amaral Dos Santos Pinto M., Povoa A. A., Correa V. R., De-la-Torre G. E., et al. (2022). Cigarette butts in two urban areas from Brazil: Links among environmental impacts, demography and market. Environ. Res. 213, 113730. doi: 10.1016/j.envres.2022.113730
Santos-Echeandía J., Zéler A., Gago J., Lacroix C. (2021). The role of cigarette butts as vectors of metals in the marine environment: Could it cause bioaccumulation in oysters? J. Hazard. Mater. 416, 125816. doi: 10.1016/j.jhazmat.2021.125816
Shen M., Li Y., Song B., Zhou C., Gong J., Zeng G. (2021). Smoked cigarette butts: Unignorable source for environmental microplastic fibers. Sci. Total Environ. 791, 148384. doi: 10.1016/j.scitotenv.2021.148384
Slaughter E., Gersberg R. M., Watanabe K., Rudolph J., Stransky C., Novotny T. E. (2011). Toxicity of cigarette butts, and their chemical components, to marine and freshwater fish. Tob. Control 20 Suppl 1 (Suppl_1), i25–i29. doi: 10.1136/tc.2010.040170
Soleimani F., Dobaradaran S., De-la-Torre G. E., Schmidt T. C., Saeedi R. (2022a). Content of toxic components of cigarette, cigarette smoke vs cigarette butts: A comprehensive systematic review. Sci. Total Environ. 813, 152667. doi: 10.1016/j.scitotenv.2021.152667
Soleimani F., Dobaradaran S., Mohebbi G., Vazirizadeh A., De-la-Torre G. E., Saeedi R., et al. (2023). Toxic effect of cigarette butts leachates on blood markers of Periophthalmus waltoni species from the Persian Gulf region. Chemosphere 319, 138036. doi: 10.1016/j.chemosphere.2023.138036
Soleimani F., Dobaradaran S., Vazirizadeh A., Mohebbi G., Ramavandi B., De-la-Torre G. E., et al. (2022b). Chemical contents and toxicity of cigarette butts leachates in aquatic environment: A case study from the Persian Gulf region. Chemosphere 311 (Pt 2), 137049. doi: 10.1016/j.chemosphere.2022.137049
Torkashvand J., Godini K., Jafari A. J., Esrafili A., Farzadkia M. (2021). Assessment of littered cigarette butt in urban environment, using of new cigarette butt pollution index (CBPI). Sci. Total Environ. 769, 144864. doi: 10.1016/j.scitotenv.2020.144864
Keywords: CBs pollution, social behavior, microplastic pollution, ecological impacts, social burden, environmental perspective
Citation: Yang S, Gu C and Yang Q (2023) The unignorable ecological impact of cigarette butts in the ocean: an underestimated and under-researched concern. Front. Mar. Sci. 10:1266536. doi: 10.3389/fmars.2023.1266536
Received: 25 July 2023; Accepted: 12 September 2023;
Published: 22 September 2023.
Edited by:
Tieyu Wang, Shantou University, ChinaReviewed by:
Sina Dobaradaran, Bushehr University of Medical Sciences, IranCopyright © 2023 Yang, Gu and Yang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Qiying Yang, eWFuZ3FpeWluZ0BjdWcuZWR1LmNu