New Study Unveils Health Risks from Cigarette Butts' Microplastics

A recent study has revealed alarming health risks associated with microplastics found in cigarette butts, suggesting they trigger inflammatory responses in human immune cells. Conducted by a team of scientists, the research exposed immune cells from human blood to fibers extracted from cigarette filters made of plastic cellulose acetate. The findings, published on February 11, 2025, indicated that these fibers prompted a significant release of inflammatory proteins, including tumor necrosis factor-alpha and interleukin-6. At high concentrations, the cells exhibited severe stress, leading to cell death.

Researchers pointed out that although cigarette butts are commonly perceived as biodegradable, they can take over a decade to break down, during which they release toxic substances into the environment. Approximately 4.5 trillion butts are discarded globally each year, and their environmental impact has long been a concern for wildlife. However, this study suggests they may also pose direct health risks to humans, potentially linking to serious conditions like heart disease and cancer.

In response, environmental groups and lawmakers are advocating for stringent regulations on plastic cigarette filters and exploring biodegradable alternatives.