A questionnaire relating to smoking habits, respiratory symptoms, and health attitude was administered to schoolchildren aged between 11 and 17 throughout a defined geographical area in both 1975 and 1979, with a valid response from 10498 and 12002 young people respectively. Each cohort was almost entirely different. The results suggest that although the prevalence of regular smoking has decrea...

ALL BUT A FEW countnes throughout the world hsd one or more public progrtlms provldmg some type of social security protectlo* m 1977. Some of these programs date back to the late 19th century and contam extensive provwons Some other systems-pnrtlculsrly those of the 60 countries that obtamed their independence during the past two decades-are much ne\\er and, as a consequence, are still quite ln...