To many people, smoking is not only a pleasure but also an addiction. They need smoking, depend on it, and can hardly get rid of it. If they do not smoke for hours, they will feel a craving for a cigarette. They often chain-smoke that means they light one cigarette after another. Smoking is often considered anti-social because many people do not like the smell of cigarettes or the sight of the smoker's stained fingers and of ash-trays full of cigarette-ends. Above all, smoking is harmful to health. In many countries, they forbid to advertise cigarettes and a warning is printed every packet of cigarette that is "Smoking is bad for your health". Scientists have proved that there is a close link between smoking and lung diseases, such as cough and tuberculosis and the worst of all is a fatal cancer.