Smoking increases the toxins in your lungs and obstructs good airflow over the smaller airways and bronchioles . Smoking can effect the vessels of the circulatory system and cause them to become stifferand not function as well
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.
Explanation: The question says in contrast to the 60% so were finding the other percentage to equal the whole 100% of the class. You would take 100 and subtract 60 from it to get an answer of 40%.
