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Secondhand smoke, which is inhaled by those nearby, contains many of the same toxic chemicals found in firsthand smoke

They can eat anything

Inside the rings is the PM2.5 display, which reveals when the air purifier detects particulate matter 2.5 microns or less

Most traditional air purifiers would require weekly filter washing to keep up with shedding from multiple pets

assessed using a binary abstinence indicator, where participants were classified as either abstinent (high abstinence score) or not abstinent (low abstinence score) at each time point

RESULTS Basic information and tobacco prevalence A total of 763 questionnaires were collected online in this survey, of which 728 were valid, resulting in an effective response rate of 95.4%