High-puff e-cigarettes may become more toxic with use. Researchers warn that repeated vaping can create harmful byproducts linked to lung cell damage. Heavily used high-puff electronic cigarettes may contain higher levels of harmful chemicals than fresh e-cigarettes.

High-puff e-cigarettes may become more toxic with use. Researchers warn that repeated vaping can create harmful byproducts linked to lung cell damage. Heavily used high-puff electronic cigarettes may contain higher levels of harmful chemicals than fresh e-cigarettes.