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Human bronchial epithelial cells exposed in vitro to cigarette smoke at the air-liquid interface resemble bronchial epithelium from human smokers

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Destruction of airway barrier integrity exposes sub-epithelial layer to inhaled particles, triggering airway inflammation and immune responses, indicating that airway epithelial barrier dysfunction is closely related with respiratory diseases [5, 9]

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J Public Health (Oxf), 2020

I quit smoking cigarettes in May of 2017 but began vaping then and continued to vape for 3 years after I quit smoking