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Cigarette Butt Pollution in Aquatic Ecosystems: Sources, Environmental Fate, Ecotoxicological Impacts and Mitigation Strategies
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Cigarette butts are one of the world's most common types of litter, and this review shows they leak toxic chemicals and tiny plastic fibers into rivers, lakes, and oceans, harming fish and other wildlife. These pollutants can build up in aquatic animals, meaning they could eventually make their way into the seafood we eat, so reducing cigarette litter matters for both ecosystems and our own health.
ABSTRACT Cigarette butts (CBs) are one of the most abundant forms of anthropogenic litter worldwide and represent an important source of chemical and microplastic pollution in aquatic ecosystems. An estimated 4.5 trillion CBs are discarded annually, with a substantial proportion entering freshwater, estuarine and marine environments. Cigarette litter contains a complex mixture of hazardous substances, including nicotine, cotinine, polycyclic aromatic hydrocarbons (PAHs), heavy metals, aromatic amines, BTEX compounds, tobacco‐specific nitrosamines and cellulose acetate microfibres. Evidence from laboratory and field studies demonstrates that cigarette‐butt‐derived contaminants adversely affect a wide range of aquatic organisms, including phytoplankton, zooplankton, molluscs, crustaceans, polychaetes, fish and microbial communities. Reported effects include mortality, oxidative stress, neurotoxicity, developmental abnormalities, reproductive impairment, behavioural alterations, histopathological damage and disruption of ecological processes. This review synthesises current knowledge on the occurrence, environmental fate, chemical composition, persistence and ecological impacts of CB pollution in aquatic ecosystems. Several studies have demonstrated the bioaccumulation of nicotine, metals, PAHs and other tobacco‐related compounds in aquatic organisms, raising concerns regarding their potential transfer through aquatic food webs. The review also examines the environmental persistence of cellulose acetate filters and their potential role as sources of both chemical pollutants and microplastic fibres. Emerging mitigation approaches, including waste valorisation, bioremediation, behavioural interventions, improved waste management, extended producer responsibility and other policy‐based source‐reduction strategies, are critically evaluated. The review identifies major knowledge gaps, particularly the limited availability of environmentally realistic, chronic, multi‐generational and ecosystem‐scale studies, and highlights the need for integrated source‐reduction and long‐term ecological risk assessment strategies.
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This review pulls together 47 studies showing that discarded cigarette butts leak toxic chemicals, nicotine, and tiny plastic particles into soil and water, harming fish, plants, and other wildlife. While the focus is on ecosystems, it's a reminder that this common litter is a lasting pollution source, and its ripple effects on the environment we depend on are still not fully understood.
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This review of existing research shows that cigarette butts are the world's most common plastic trash, slowly breaking down into tiny plastic fibers that spread harmful chemicals like nicotine and heavy metals into water and soil. These microplastics hurt fish and other animals by changing their behavior and building up in their bodies, which could affect the entire food chain. Since humans eat fish and use water from these contaminated environments, cigarette butt pollution may pose health risks that need more research and better cleanup solutions.
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This review examines the environmental impact of discarded cigarette butts, which number in the trillions worldwide each year and are among the most common litter items. Researchers found that cigarette filters release harmful substances including heavy metals, nicotine, and cellulose acetate microplastic fibers when they enter water. The study highlights that cigarette butt pollution represents a significant but often overlooked source of both chemical contamination and microplastic pollution in aquatic environments.
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Researchers reviewed the environmental pollution caused by the use and disposal of cigarettes and electronic cigarettes, including their role as a source of microplastic contamination. Cigarette butts made of cellulose acetate are minimally degradable and represent a major source of both bulk plastic and microplastic pollution, particularly in aquatic ecosystems. The study documents that cigarette butt leachate and nicotine are toxic to a wide range of organisms from microbes to mammals.
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