Millions of toxic e-cig butts can be recycled into asphalt pellets that boost road durability and cut carbon. They contain plastic, and are loaded with nicotine salts, heavy metals, and lead. The additive would improve crack resistance and reduce the need for repairs.
https://www.ugr.es/en/about/news/design-sustainable-and-more-resistant-asphalt-using-cigarette-butts