CLAUDEJEANRENAUD NILS SOGUEL Smoking is a very common habit all over the world. The prevalence rate ranges from 20% - 40% in industrialised countries, and is dramatically increasing in the developing world. Smoking is risky and there is ample scientific evidence to support this statement. We know that smoking is a major cause of disease and premature death, in view of the fact that 3 million people die each year worldwide as a result of their smoking habit. Twenty years ago, the U. S. Surgeon General identified smoking as the single most important cause of morbidity and premature death...