A VERY BIG MISUNDERSTANDING...

Let me make it clear... a person with cigarettes and lighter DOES NOT MEAN he smokes...

I was just doing some research only...

What is the chemical composition of tobacco?
The burning of tobacco generates approximately 4000 compounds. The smoke can be separated into gas and particulate phases. The composition of the smoke delivered to the smoker depends on the composition of tobacco and how densely it is packed, the length of the column of tobacco, the characteristics of the filter and the paper, the temperature at which the tobacco is burned.
Among the gaseous phase components are carbon monoxide, carbon dioxide, nitrogen oxides, ammonia, volatile nitrosamines, hydrogen cyanide, volatile sulfur containing compounds, volatile hydrocarbons, alcohols and aldehydes and ketones. Some of these compounds inhibit ciliary movement in the lungs. Tar is the compound in tobacco that remains after the moisture and nicotine are subtracted and consists of polycyclic aromatic hydrocarbons, which are carcinogens. Non-volatile nitrosamines and aromatic amines play an etiologic role in bladder cancer. The actual content of nicotine in tobacco can vary from 0.2% to 5%.
What is the pharmacology of nicotine?
Diverse effects of nicotine occur as a result of both stimulant and depressant actions on various central and peripheral nervous system pathways. This drug can increase the heart rate by excitation of the sympathetic nervous system, or by paralyzing the parasympathetic nervous system. Nicotine affects the medulla in the brain to increase heart rate. Nicotine causes a discharge of epinephrine from the adrenal medulla, which causes an increase in heart rate and raises blood pressure.
What are the physiological effects of nicotine?
Briefly, nicotine can stimulate the brain at all levels, significantly increase breathing, lower HDL ( the good fats) levels, increase blood pressure and constrict peripheral blood vessels.
Some individuals experience nausea and vomiting, decreased urinary flow, increased free fatty acids. Nicotine increases the oxygen requirements of the heart muscle, but lowers oxygen supply, and this effect may lead to heart attacks. Nicotine initially stimulates the salivary and bronchial secretions and then inhibits them. Cigarette smoke causes the excessive saliva associated with smoking. Nicotine inhibits hunger and also causes a slight increase in blood sugar, and deadens the taste buds. Smokers often report weight gain and appetite increase after quitting smoking.
What are the clinical uses of nicotine?
Cigarettes, cigars and spit tobacco have no role in clinical medicine. Nicotine chewing gum (nicorette) may be useful for individuals who are trying to quit smoking.

Thats all about it.