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It is the dried leaves of the tobacco plant.

It can be smoked in cigarettes, pipes or cigars. 

It can be sniffed as snuff (very popular until the 

mid nineteenth century). It can also be chewed. 

There are three major substances in Tobacco smoke. 

They are Nicotine, Tar and Carbon Monoxide.

Nicotine is the drug in tobacco. It is also used as a 

poison. It can cause people to become dependent 

through regular use. It takes 7.5 seconds for nicotine 

to act on the brain after inhaling cigarette smoke. 

Firstly the brain is stimulated, then it relaxes and slows 

down. Nicotine is absorbed and distributed to other 

body organs very quickly. 

Tar is the main cause of lung and throat 

cancer. It aggravates bronchial and respiratory 

disease. One packet of cigarettes                

per day means a smoker inhales more than                                                      

half a cup of tar per year, approximately 

150mL. The benefits from smoking low tar 

cigarettes are limited. The yellow staining on 

fingers and teeth is caused by tar. 

Carbon monoxide is an odourless, colourless 

and very toxic gas. It is found in car exhaust 

fumes and in smoke from fires. Carbon monoxide 

enters the blood more easily than oxygen. 

There are also other substances found in 

Tobacco smoke. There are small amounts of more 

than 4000 other substances, some toxic, some 

known to cause cancer. 

The effects of smoking vary from person to 

person. The effects, for example, depend on 

whether the person is male or female, family 

history and where the person works.

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