Vaping is often sold as the lighter cousin of smoking. Many people pick up a vape thinking the fruity cloud is close to harmless. The deepest parts of the lung may tell a different story.
A new study in JCI Insight, led by researchers at National Jewish Health in Denver, looked at what happens inside the deep lung during e-cigarette use. Just 24 hours of vapor was enough to injure the delicate cells where oxygen crosses into the blood.
The injured area is called the distal lung. It is the thin tissue where the air you breathe meets the bloodstream. Damage there can quietly disrupt how well the body takes in oxygen.
In the lab, researchers ran e-cigarette vapor over human lung cells at levels meant to mimic casual vaping. Within 24 hours the protective barrier of the deep lung weakened, cells became stressed, repair slowed and more cells died.
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Signs of stress stayed in the lung 10 days later
The team then moved from cells to live animals. Hamsters inhaled e-cigarette vapor every day for five days. Ten days after the vaping stopped, their lung tissue still carried markers of cell stress and cell damage.
Senior author Dr. Irina Petrache, chief of Pulmonary, Critical Care and Sleep Medicine at National Jewish Health, summed up the main worry in a statement reported by News-Medical.
"Even short-term vaping exposure can initiate injury in the deepest and most delicate regions of the lung," she said.
She added that some effects persisted after exposure ended and altered the immune response to a later viral infection.
Weaker defense against the next respiratory virus
The researchers then infected the hamsters with SARS-CoV-2, the virus that causes COVID-19. Animals that had vaped before infection carried more virus in the upper airway during the early days of illness.
An RNA analysis of the vapor-exposed lungs showed that several key antiviral genes were turned down after the virus hit. The lungs appear less ready to mount a strong immune defense.
The findings come from lab-grown human cells and golden Syrian hamsters, not from clinical trials in people. This is early biological evidence rather than proof that casual vaping harms the lungs of every user the same way.
About 7 percent of US adults said they used e-cigarettes in 2024, according to the CDC, up from 3.7 percent in 2020.
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This article is made and published by Aksel Kryhlmand, who may have used AI in the preparation.