Paper straws are not inherently harmless. In certain aspects, their potential harms may even surpass those of traditional plastic straws, especially when considering chemical coatings, user experience, or lifecycle impacts.
Perhaps the most alarming discovery in recent years is the prevalence of per- and polyfluoroalkyl substances (PFAS) in paper products. A 2023 study in Belgium examined 39 types of straws and found that nearly 90% contained PFAS. These "forever chemicals" are used to provide the water- and oil-resistant properties that prevent the straw from dissolving instantly. Because PFAS are highly persistent and bioaccumulative, they have been linked to severe health issues, including thyroid disease, elevated cholesterol, and even cancer. Notably, many compliant plastic straws do not rely on such chemical coatings.
To prevent paper from becoming overly soft, manufacturers often apply coatings such as polyethylene (PE) or polypropylene, or use adhesives containing formaldehyde. This creates a significant risk during use: when exposed to hot beverages (above 50°C), the migration of these substances—including heavy metals and fluorescent whitening agents—into the drink can accelerate. Conversely, in terms of chemical leaching, high-quality, single-material plastic straws (such as PP or PE) often pose a lower risk of substance migration under thermal stress.
Beyond chemistry, there is the issue of physical safety. As paper straws absorb moisture, they lose structural integrity and often break into fibers that can be ingested. Furthermore, the porous, rough surface of a degrading paper straw can become a breeding ground for bacteria. If not individually sealed, these straws are more susceptible to mold or E. coli contamination than sealed plastic straws with a smooth, nonporous surface.
Producing one ton of paper straws requires about 20 tons of water and often causes significant industrial pollution during pulping, along with high energy use. Additionally, many paper straws are coated with plastic, making them impossible to compost and difficult to recycle. If mixed with standard paper recycling streams, these coated straws can contaminate and degrade the quality of recycled paper pulp. While standard plastic straws are also difficult to decompose, their single-material composition makes recycling pathways clearer.
Consumers often ingest ink (containing aromatic amines), adhesives, or PFAS by chewing or licking softened paper straws. Children and the elderly are more likely to inhale debris from deformed straws, a risk that is conversely lower with plastic straws because of their high mechanical strength.
While the toxicity of plastic straws (e.g., bisphenol A) may not necessarily be lower under equivalent compliance standards, the market includes a significant share of paper straws that are irregularly treated with waterproofing or bleaching chemicals, and regulatory enforcement is inconsistent. This creates greater health uncertainties. High-quality, natural-tasting paper straws pose limited short-term risks, but low-quality or PFAS-containing products can be "more harmful."
The current mainstream trend is shifting toward PLA (polylactic acid) biodegradable straws, precisely because paper straws present significant contradictions in health risks, user experience, and actual environmental benefits when used as a more eco-friendly alternative to plastic counterparts.
