A Baylor College of Medicine study, funded by the National Institute of Health (NIH), shows chronic exposure to e-cigarette vapors damages lungs and lowers immune response to pathogens. The four-month study, which did not address the additional harms caused by nicotine, revealed that vaping alters the composition of epithelial and immune cells of the lungs, causing a buildup of lipids (insoluble fat) that affect lung function and reduce the ability to fight off infection.
The study proposes the cause of the lung cell malfunction is linked to the vaping liquids which contain solvents such as propylene glycol (PG) and vegetable glycerin (VG). These types of solvents are FDA-approved for ingestion, not inhalation. E-cigarette liquids are also known to contain a host of unknown chemicals that may cause further damage.