Effect of cigarette smoking in human body

There are approximately 4000 chemicals in cigarettes. Many are known to be harmful substances, including tar, nicotine, carbon monoxide, benzene, formaldehyde and hydrogen cyanide. More than 50 of these chemicals are carcinogenic (cause cancer).

Smoking Effects on the Human Body

-Carbon monoxide binds to haemoglobin in red blood cells, preventing affected cells from carrying a full load of oxygen.

-Cigarette smoking causes reduced circulation by narrowing the blood vessels (arteries) and puts smokers at risk of developing peripheral vascular disease (i.e., obstruction of the large arteries in the arms and legs that can cause a range of problems from pain to tissue loss or gangrene)

-Smoking causes lung diseases by damaging the lining of the airways and alveoli (i.e., small air sacs) of the lungs. It also causes lung cancer which is a highly lethal disease; only a small minority of patients are alive five years after diagnosis. Smoking also causes cancer of the oral cavity, pharynx, larynx, esophagus, pancreas, kidney, bladder and cervix. 

-Cigarette smoke cause cilia in respiratory tract to stop moving. Repeated smoking kills the cilia. The smoke also kills phagocyte cells that helps to get rid of foreign particles and bacteria. This cause a person to be more susceptible to  infections 

-Young people who smoke or use smokeless tobacco are at immediate risk of a range of health problems, including nicotine addiction, increased cough, phlegm, and wheezing, reduced lung function and a worsening of problems from asthma.

-Those who start to smoke at an early age are more likely to develop severe levels of nicotine addiction than those who start later, and they are at higher risk of health consequences in adult life.

-Non-smokers, both children and adults, can be harmed by second hand tobacco smoke generated by other people's smoking.