Why does my DIY air purifier not work? Intended use is to filter vaping odors. CFM should be cleaning air several times an hour, but VOC level never drop, no matter the E cigarette or Vaping Use Associated Lung Injury (EVALI) American Lung Association Nerd Snacks by @science Cigarette butts are the world's most littered waste, with up to 9 trillion thrown away every yearand they take years to break down. Instagram Who Made That Cigarette Filter? The New York Times