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Hyperinflation from exercise is linked to shortness of breath in COPD, as breathing in is less comfortable when the lungs are already partly filled

1 2 3 "Rules and Regulations Implementing Republic Act 9211, Otherwise Known as the Tobacco Regulation Act of 2003" (PDF)

While the principle that a filter might remove toxic chemicals from the smoke is a simple one, designing cigarettes with a filter that effectively removed chemicals from the smoke was technically challenging for the tobacco industry

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