do cigarettes cause mucus Smoking & Respiratory Health: Impact on the Lungs Smoking exposes the respiratory system to toxic chemicals that damage airway lining and lung tissue. The cilia that normally clear become impaired, leading Stopping Smoking - Chest Heart

With the passage of a new law, the Federal Trade Commission in 1967 began testing all cigarette brands on special smoking machines that measured the amount of tar inhaled

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Science 2012;336:2415

Almost every state government has put restrictions on smoking

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