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Bioaccumulation and biological effects of cigarette litter in marine worms
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Researchers exposed ragworms — common coastal sediment-dwelling invertebrates — to toxicants leached from smoked cigarette filters, finding significant harm including over 30% weight loss, longer burrowing time, and doubled DNA damage at concentrations 60 times lower than those found in urban runoff. Cigarette litter, which makes up the largest share of coastal debris worldwide, poses a serious but underappreciated threat to marine life through its chemical pollution.
Marine debris is a global environmental issue. Smoked cigarette filters are the predominant coastal litter item; 4.5 trillion are littered annually, presenting a source of bioplastic microfibres (cellulose acetate) and harmful toxicants to marine environments. Despite the human health risks associated with smoking, little is known of the hazards cigarette filters present to marine life. Here we studied the impacts of smoked cigarette filter toxicants and microfibres on the polychaete worm Hediste diversicolor (ragworm), a widespread inhabitant of coastal sediments. Ragworms exposed to smoked cigarette filter toxicants in seawater at concentrations 60 fold lower than those reported for urban run-off exhibited significantly longer burrowing times, >30% weight loss, and >2-fold increase in DNA damage compared to ragworms maintained in control conditions. In contrast, ragworms exposed to smoked cigarette filter microfibres in marine sediment showed no significant effects. Bioconcentration factors for nicotine were 500 fold higher from seawater than from sediment. Our results illustrate the vulnerability of organisms in the water column to smoking debris and associated toxicants, and highlight the risks posed by smoked cigarette filter debris to aquatic life.
More Papers Like This
Ecotoxicological effects of cellulose acetate nanoplastic derived from cigarette butts on earthworm (Allolobophora caliginosa): Implications for soil health
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Researchers investigated how nanoplastics derived from cigarette butts, one of the most common forms of litter worldwide, affect earthworms in soil. Nanoplastics from smoked cigarette butts were the most toxic, causing increased mortality, growth suppression, DNA damage, and heightened oxidative stress compared to unsmoked or commercially produced cellulose acetate particles. The findings suggest that the combustion by-products absorbed by cigarette filters make their plastic waste significantly more harmful to soil organisms.
Microplastics from cigarette filters: Comparative effects on selected terrestrial and aquatic invertebrates
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Researchers compared the effects of microplastics from smoked and unsmoked cigarette filters on both land and water invertebrates. Smoked filter microplastics were more toxic due to the added chemicals from tobacco smoke, causing reduced survival and reproduction in the test organisms. Since cigarette butts are one of the most littered items worldwide, this study shows they are a significant and underappreciated source of toxic microplastic pollution in the environment.
Environmental Toxicity of Cellulose Acetate Nanoplastics from Cigarette Butts in earthworm Allolobophora caliginosa: A Histological and Ultrastructural Assessment
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Discarded cigarette butts break down into tiny plastic particles (nanoplastics) that leach into soil, and this study found they damage the skin and tissue of earthworms, with butts that had actually been smoked causing the worst harm. Since earthworms are essential for healthy soil that grows our food, this suggests cigarette litter could be quietly poisoning the ecosystems we depend on, adding another reason to worry about how nanoplastics move through the environment and potentially up the food chain to us.
The impacts of littered cigarette butts on the common periwinkle (Littorina littorea)
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This study assessed how littered cigarette butts, estimated at 4.5 trillion discarded annually, affect the common periwinkle snail after entering waterways, where cellulose acetate filters leach toxic chemicals. Cigarette butt exposure caused measurable harm to periwinkles, demonstrating that this overlooked litter type poses a genuine ecotoxicological risk.
Smokers’ behaviour and the toxicity of cigarette filters to aquatic life: a multidisciplinary study
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Researchers combined behavioral observation of 597 smokers with ecotoxicity tests on cigarette filters, finding that younger smokers and those in groups were more likely to litter, and that cigarette filter fibers — made from semisynthetic plastics — are highly toxic to freshwater insect larvae even at very low concentrations. Sediment exposure was especially harmful, causing over 20% higher larval mortality and severely stunted growth and development.
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