To the Editor: The findings reported by Gomez-Marin et al. (May 28 issue)1 suggest that the improvement in long-term survival among patients hospitalized with acute myocardial infarction between 1970 and 1980 was related to improved medical care in the acute phase, continued care plus secondary prevention after recovery, or both. The improvement in survival could not be attributed to decreased severity in the 1980 sample. The authors suggest that improvement in risk-factor levels may have contributed to the improvement in survival after myocardial infarction. Smoking status and interventions for smoking cessation were not described by the authors. Since smoking status….