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r L >, ef jetN e~r~ork~ime~ FRIDAY, SEPTEMBER 6, .196d ' Page 45 A New Smoking-Heart' .7`heory ----- By JANE E,.BRODY ~nflict With Belief cates that tt ~is worth looking cil. About 40 per cent of the A study of 16,000 male. ~ for anothe= explanation," Dr. pairs . were identical twins, The heart-disease findings tWins has - indicated that' I' in the study conflict with the. i Hrubec conciqded.. Dr„ Hr}bec said, Twins were sbme r f~ctor other than I widely held belief in the 'Asked ~ hortfanettt on'the ~o3ta ''tecause their en- c~ ettes - perhaps genetia ' medical community that eig- I~udy, Dr. E. Cuyler Ham- viiqnments and genetic her- `~ arette smokin is a cause of mond, statistici~p.#or;~the constitution - may explai~ g ~~~can Cancer Soctet , I~~~ ~~'to be similar. heart'~ disease. y Each ~, com 1 the bften-observed relatioR- tidto has studied the effects p eted a A Federal Government re- quclitionnaire that included. Iship between cigarette port issued last summer con- of ~o~g among more than aa~o~,~Q~ey ~gg thforma- sinoking and heart disease. cluded' that middle-aged men ~ ml~on $ersons•aaid: ' tibrt ~liont his smoking hab- On~ the other hand, the 1 th[nk rtis likely -that its, symptoms of heart dis- who smoke 10 or more cig- male-twin study supported arettes a day were three heredity plays a role, but I ease such as chest pains, and the belief that cigarette times more likely to die of don t think it is a predomi- symptoms of respiratorydis- nant rote" smoke is a cause of resplra- heart disease than men who Dr. Hammond added that ease such as chmaic cough. never smoked regularly. For ` For purposes ot eomparmg tory disorders, which would women smokers, the heart , he could not comment direct- the subjects with the general include bronchitis, emphy- disease rate was twice as ' ly on the male-twin study be- population+ the researchers sema and: lung cancer. high as for nonsmokersm cause he had not had an divided the twins into groups Results of the male- The Government report, !opportunity to analyze its that did not include any re- twin study were released Yes- methods and findings. prepared by the United lated pairs. In comparing terday by the University of States Public Health Service, ; The 8,000 male-twin pairs twin wzth twin, they singled Cincinnati' Medical Center- cited cigarette smoking as a;~ the study were selected out those"pairs ih which o~e The study was done by Dr. robable cause of death from i from' the twins registry of twin smoked and the other. Edward P. Radford of the ~eart disease, , ~ the National Research Coun-"^ •did not. university and two Swedish Dr. Radford, a member of scientists - Drs. Lars Fri- the University of Cincinaati berg, and Rune Cederlof, who team, suggested on the basis were visiting scholars there of the team's findings that - im collaboration with Dr: heredity might be the mys- Zdenek Zdenek Hrubec of the Nation- tery factor that makes it al Research Council. more likely for a person to The researchers found that take up smoking and more when the twin pairs were - likely for him to develop separated into two groups, heartdiseaset each group consisting of But Dr. Hrubec, of the Na- 8,000 unrelated men, symp- tional Research Council, be- toms of heart and respira- lieves that something in the tory disease were mdre com- environment is responsibie- ', ' monly found among the group perhaps life style, social of smokers than among the stress, or drinking behavior. ' group of nonsmokers. This I "Our study strongly indi- ,' agrees with fihding3 amon g the general, population. But when a twin who { smoked was compared with his brother who did not : smoke, the researchers found that both twins were equally . likely to have symptoms of ;, heart disease. Symptoms of ;' respiratory disease, however, were much more likely to be found only in the twin who !' smoked. (3) '