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Dripping is a more labor-intensive method of vaping in which the user manually applies a few drops of liquid directly to the exposed heating coil of the e-cig every so many puffs, said Alan Shihadeh, a professor of mechanical engineering and director of the Aerosol Research Laboratory at the American University of Beirut

This skepticism among non-users might be influenced by established health warnings and campaigns that emphasize the potential health risks associated with vaping, particularly when it serves as an alternative to complete cessation

"[Even] a mask with highly efficient particle-filtering material may confer little protection when worn," the authors wrote, in part because the masks often fit poorly and moved around while they were strapped to someone's face

doi:10.1152/jn.00321.2004