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Freis, 1954

Theres no federal standard, so its essentially dealers choice on the operator side
This could be multiple or single

Under lab conditions, HEPA filters (like those we tested) remove 99.97 percent of the hardest-to-filter particlesbut in the real world, new particles are constantly entering your home through windows, doors, and vents

Researchers dont fully understand the link between smoking and hypertension

"E-Cigarette Use Among Youth and Young Adults: A Report of the Surgeon General" (PDF)
