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They are primarily used to prevent the spread of respiratory infections and maintain a sterile environment during medical procedures
Goicoechea JZ, Boughner A, Lee JJC et al (2024) Respiratory symptoms among e-cigarette users without an established smoking history in the VERITAS cohort
Forced expiratory volume is the amount of air that can be blown out of the lungs in one second

Your doctor may also want to measure your lungs function by conducting a pulmonary function test