How does smoking affect the respiratory and circulatory systems? ?

Respiratory system: smoking irritates the windpipe and voice box. The lung airways will also swell and narrow, and there will be excess mucus in the lung passages. It also affects the lung's clearance system, which may lead to toxic buildup.  

Circulatory system: There will be raised heart rate and blood pressure. Blood will also become stickier and more prone to clotting. The lining of the arteries will also be damaged. Smoking will reduce blood flow to fingers and toes; will also constrict blood vessels in the skin. 

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