Smoking - is a disease.

     Tobacco smoking is classified as a Mental & Behavioural Disorder under the WHO International Classification of Diseases 
(ICD-10) coded as F17.2

Tobacco users are nicotine addicts.

Why do people smoke?

To relax.
For the taste.
To fill the time.
" Something to do with my hands. "
But, for the most part, people continue to smoke
because they find it too uncomfortable to quit.

Why is it so difficult to quit smoking?

1. Physical dependence on nicotine.
2. Behavioural dependence. 

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