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Cloth materials like cotton or polyester can block some large smoke particles, but they struggle with ultrafine particles (like PM2.5) that easily pass through loose fabric weaves

From the Chief Medical Officer: How State Health Officials Can Make a Stand Against Menthol September 19, 2023 | Marcus Plescia When I started my public health career in North Carolina, I had limited expectations about what a health agency could accomplish in tobacco control

This could be every six to eight weeks or up to every three or four months

Because of their irregular shapes they are hard to get into exact weights

Ethics declarations Competing interests Yusuff Adebayo Adebisi received funding in the past through the Tobacco Harm Reduction Scholarship and the Kevin Molloy Fellowship, both awarded by Knowledge-Action-Change (KAC) UK, an independent public health organisation