Smoking is a practice in which a substance, most
commonly tobacco, is burned and the smoke is tasted
The most common method of smoking today is
Cigarette smoke contains the following:
Nicotine is a drug that stimulates the brain. It is highly
addictive. nicotine withdrawal symptoms are as
following: craving, anxiety, restlessness, headaches,
irritability, hunger, difficulty with concentration, or
just feeling awful.
most of the smokers smoke regularly just to feel
normal, and to prevent nicotine withdrawal
Tar contain many chemicals. These deposit in the
lungs and can get into the blood vessels and be carried
to other parts of the body. Cigarette smoke contains
over 4,000 chemicals, including over 50 known
carcinogens (causes of cancer) and other poisons
CO is a poisonous gas which affects the blood. This
chemical affects the oxygen-carrying capacity of the
blood. In particular, in pregnant women who smoke,
this causes a reduced amount of oxygen to get to the
growing baby. This is thought to be the most
important cause for the bad effects of smoking on the
Other substances a cigarette contains
smoking causes lung
cancer by damaging the
cells that line the lungs.
Chronic obstructive pulmonary disease (COPD)
Other cancers - of the mouth, nose, throat, larynx,
gullet (esophagus), pancreas, bladder, cervix, blood
(leukemia), and kidney are all more common in
Circulation. The chemicals in tobacco can damage
the lining of the blood vessels and affect the level of
lipids (fats) in the bloodstream. This increases the risk
of atheroma forming (sometimes called hardening of
the arteries). Atheroma is the main cause of heart
disease, strokes, peripheral vascular disease (poor
circulation of the legs), and aneurysms (swollen
arteries which can burst causing internal bleeding).
All of these atheroma-related diseases are more
common in smokers.
Rheumatoid arthritis. Smoking is known to be a risk
factor for developing rheumatoid arthritis. One
research study estimated that smoking is responsible
for about 1 in 5 cases of rheumatoid arthritis.
Ageing. Smokers tend to develop more lines on their
face at an earlier age than non-smokers. This often
makes smokers look older than they really are.
Breathing In the smoke exhaled by smoker is very
dangerous for non-smokers as it contains more than
4000 chemical compounds of which 250 are toxic and
more than 50 are known cancer-causing agents. These
dangerous substances linger in the air for
approximately 4 hours and breathing in these particles
for only minutes can be harmful. Breathing in such
toxic gasses is called secondhand smoking
Effects of second hand smoking
Lung cancer and lung disease, including COPD,
emphysema, asthma, and chronic bronchitis.
Nonsmokers who live with a smoker have a 20% to
30% increased risk for developing lung cancer
Eye and nasal irritation; increased risk of sinus and
603,000 people died in 2004 because of second
hand smoke including 28% of children while 47%
Smoking increases the risk of developing
various other conditions including:
and Reynaud's phenomenon.
Other conditions where smoking often
causes worse symptoms include:
and Crohn's disease.
Cigarette smoking causes an estimated 443,000 deaths
each year, including approximately 49,000 deaths due
to exposure to secondhand smoke.
Lung cancer is the leading cause of cancer death
among both men and women and 90 percent of lung
cancer deaths among men and approximately 80
percent of lung cancer deaths among women are due
People who smoke are up to six times more likely to
suffer a heart attack than nonsmokers, and the risk
increases with the number of cigarettes smoked.
Smoking also causes most cases of chronic lung
Around the world, Nearly 16 percent of high school
students smoke cigarettes.
Smoking causes the most number of deaths around
the word per year