Some scientists are now focusing on tinier particles, the ones that spread more like cigarette smoke. Those are carried by wisps of air and even upward drafts caused by the warmth of our bodies. They can linger in the air for minutes to hours, spreading throughout a room and build up if ventilation is poor.
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Masking for Smoke Isn't Like Masking for COVID theatlantic.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from theatlantic.com Daily Mail and Mail on Sunday newspapers.