Scientists at National Jewish Health in Denver have published a study in JCI Insight indicating that brief exposure to e‑cigarette vapor can cause lasting injury to the most delicate regions of the lung. The research, which examined human lung epithelial and endothelial cells as well as precision‑cut lung tissue from the distal lung, found that a five‑day vaping regimen was enough to damage the protective barrier, trigger cellular stress, and increase cell death.

Key findings from the laboratory work

In pre‑clinical models, researchers exposed lung tissue samples to e‑cigarette vapor alone, and in a separate set, to vapor followed by infection with a respiratory virus. Within 24 hours, the vapor compromised the barrier function of the distal lung, slowed cell growth and repair, and impaired the cells’ ability to clear damaged components. Importantly, signs of lung stress were still evident ten days after the five‑day exposure period ended.

The team also observed lasting changes in tissue remodeling and Th1 immunity – a branch of the immune system critical for fighting viral infections. Prior vaping exposure increased the amount of SARS‑CoV‑2, the virus that causes COVID‑19, and suppressed several antiviral genes after infection.

Researchers’ perspective

Study senior author Dr. Irina Petrache, a pulmonologist at National Jewish Health, said, “Our findings suggest that even short‑term vaping exposure can initiate injury in the deepest and most delicate regions of the lung. Importantly, some effects persisted after exposure ended and altered the immune response to a subsequent viral infection.” She added that the results will need confirmation in future studies involving people, but they help explain why vaping has been linked to lung injury and greater susceptibility to respiratory infections.

The investigators warned that repeated vaping could potentially contribute to chronic lung disease by sustaining cellular injury and disrupting normal repair processes.

What this means for the public

While many view e‑cigarettes as a less harmful alternative to smoking, this study highlights that even limited use may pose serious risks to lung health. The findings underscore the importance of protecting the most vulnerable members of families – especially children and teens – from exposure to vaping products.

Health professionals recommend that individuals who currently vape consider quitting and that parents stay vigilant about the presence of e‑cigarette devices in the home. Resources for cessation are widely available through local health departments and primary‑care providers.

As research continues to uncover the biological mechanisms behind vaping‑related lung injury, the study adds to a growing body of evidence that supports cautious regulation of e‑cigarette products to safeguard public health.

Original reporting: KTBS 3 (Shreveport) — read the source article.