[Passive smoking and respiratory diseases. Current data].

Smoking is now unanimously recognised as a pathological factor and a major carcinogen. It is estimated that it is responsible for around 10% of the overall mortality in France or more than 50,000 deaths per year and in the United States for around 15% of the overall mortality or 300,000 deaths per year. There has been recent evidence that the risk linked to the inhalation of tobacco smoke does not appear only in active smokers, but also in all subjects who are involuntarily exposed to tobacco smoke. We have here planned a general review of the epidemiological studies which have looked for an association between passive exposure to tobacco and respiratory disease. In children, an increase in symptoms and respiratory infections has been observed, as well as a slowing down in pulmonary growth. In adults the effect of involuntary exposure to tobacco smoke seems above all to be carcinogenic. It is estimated that there is a 25% increase in the risk of bronchial cancer in a non smoker married to a smoker when compared to the risk observed in a non exposed non smoker. Thus the disastrous effect of smoking appears without any threshold.