1. April 1981 to 7 September 1983. A total of
2. Smoking and health now;of Physicians, Royal College,1971
3. The natural history of chronic bronchitis and emphysema;Fletcher, C.M.; Peto, R.; Tinker, C.; Speizer, F.E.,1976
4. Cigarette smoking and changes in respiratory findings;Comstock, G.; Brownlow, W.J.; Stone, R.W.; Sartwell, P.E.;Arch Environ Health,1970
5. Effects of smoking modified cigarettes on respiratory symptoms and ventilatory capacity;Freedman, S.; Fletcher, C.M.; Field, G.B.;JNatl Cancer Inst; was not significantly greater in non-inhalers than among the non-smokers. But when we,1972