20

— minutes, the time it takes for second-hand smoke to cause airway restriction in bystanders in smoke-filled bars and cars. Researchers warn that bystanders may be unaware of how much they are affected by second-hand smoke; while the participants didn’t report any breathing problems, their airways showed physiologic changes indicating impaired function

Presented at CHEST 2012 annual meeting of the American College of Chest Physicians

Click Here to view on Time.com

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