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What the respiratory system is:

The respiratory system comprises the nasal cavity, larynx, trachea, bronchi, throat and the lungs. Normally, the oxygen from the air is inhaled through the nose and guided towards the lungs, via the nasal cavity. The layer of tiny hair in the nose keeps dust and foreign bodies from reaching the lungs. The oxygen travels through the nose to the pharynx and enter the passage for air thereafter.

From the trachea, the air is taken to the bronchi, bronchioles and finally the alveoli. The alveoli have capillaries. While this process is in action, another intricate system within the human anatomy conducts a simultaneous task. The blood that leaves the heart chambers with impure blood passes through the alveoli, exchanging the carbon dioxide concentrated blood for that charged with oxygen. This energized blood then rejuvenates every cell in the body.

What the circulatory system is :

The Circulatory System is responsible for transporting materials throughout the entire body. It transports nutrients, water, and oxygen to your billions of body cells and carries away wastes such as carbon dioxide that body cells produce. It is an amazing highway that travels through your entire body connecting all your body cells.
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Damage Caused by smoking

Cigarette contains 49 carcinogenic compounds. 90% of smokers die within 3 years of being diagnosed with lung cancer. Smoking causes heartburn along with preptic ulcers besides cance of the Kidney lung bladder stomach oral cavaties and cervix. Smoking can cause lung disorders such as chronic obstuctive pulmonary disease, emphysema, bronchitis, and reduces lung function. A smokers cough is the bodies attempt to expel chemicals that have accumulated in the air ways. 33% of all males in the world smoke. the time spent smoking is roughly equal to the time cut from one's lifespan. Smoking lowers the supply of oxygen to the heart causing high blood pressure and fatal heart attacks. Smoking causes 443000 deaths, or nearly 1 of every 5 deaths, each year in the United States.1,2 More deaths are caused each year by tobacco use than by all deaths from human immunodeficiency virus (HIV), illegal drug use, alcohol use, motor vehicle injuries, suicides, and murders combining 1,3

[[http://hes.ucfsd.org/gclaypo/circulatorysys.html |http://hes.ucfsd.org/gclaypo/circulatorysys.html ]]
[[http://www.buzzle.com/articles/how-does-smoking-affect-the-respiratory-system.html ]]http://www.cdc.gov/tobacco/data_statistics/fact_sheets/health_effects/effects_cig_smoking/