Hundreds of cigarette filters and that alleged covid-stopping thin porous mask.
According to wikipedia:
“While laboratory tests show a reduction of “tar” and nicotine smoke, filters are inefficient at removing gases of low molecular weight, such as carbon monoxide. Most of these measured reductions occur only when the cigarette is smoked on a smoking machine; when smoked by a human, the compounds are delivered into the lungs regardless of whether or not a filter is used. The near-universal adoption of filters on cigarettes has not reduced harms to smokers and lung cancer rates have not declined”
The equivalent can be said about that mask, but for some reason, leftists don’t seem to like that being pointed out.