Short E-Cigarette Use May Harm Lungs

A National Jewish Health study found that a short period of e-cigarette vapor exposure harmed cells and tissue from the deep lung, where oxygen moves into the bloodstream. Researchers tested human lung cells and precision-cut lung tissue in laboratory models, then examined what happened after exposure alone and after respiratory-virus infection.

Changes appeared within 24 hours. The vapor weakened the lung’s protective barrier, increased cellular stress and death, and disrupted processes involved in clearing damaged material, growth and repair. After a five-day exposure period ended, stress-related changes remained visible 10 days later, along with altered tissue structure and immune activity involved in fighting viruses.

Previous exposure also led to more SARS-CoV-2 in the models and reduced activity of several antiviral genes after infection. Together, the findings suggest that even brief vaping may leave the lungs less prepared to handle respiratory viruses, a concern for adults who want breathing capacity and normal recovery to support an active life. The results still need to be tested in people. Researchers said repeated exposure could help sustain injury and interfere with repair, potentially contributing to chronic lung disease.