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Platt, Imperial Twilight: the Opium War and the End of China's Last Golden Age (NY: Knopf, 2018), 166-73

The higher the CADR, the more equivalent air changes per hour [ACHe] for a specific space size, and the quicker the replacement of air in your space with clean air. Several popular air purifiers didnt make our list because they had low CADR numbers or didnt provide this information

So these experiments are likely to be comparing cigarettes with greater filter ventilation to those with less or with no filter ventilation, even though the researchers have not necessarily recorded the extent of filter ventilation

Although IQOS use is currently low and its marketing strategy rather limited, now is the time to put appropriate guardrails in place to prevent its use by non-tobacco users, youth and young adults, and others at risk of persuasive advertising campaigns promoting IQOS as a reduced harm tobacco product