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Long-term exposure to secondhand tobacco smoke and/or repeated respiratory infections also can increase a person's risk for chronic obstructive pulmonary disease

CADR for smoke is rated at approximately 246 m/h, giving 45 air changes per hour in a 50m room at ceiling height consistent with the standard recommendation of 4+ ACH for smoke removal

They can be detected with an endoscopic procedure (colonoscopy or sigmoidoscopy) or CT colonography (see 'Colonoscopy' below and 'Sigmoidoscopy' below and 'CT colonography' below) and, to a lesser extent, by other tests such as the stool test for colorectal cancer

The protein contents of the samples were determined using the Siddiqui et al