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In the regw^ of the Congressional hearings there are quite a few 

 scientific witnesscs^hol^ b stimony questioned the charge that smoking 

 causes heart disease. V5 



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One of them is D£/Jii\nt Cedorlof, of the National Institute of 

 Public Health in Sweden. Profe^^r Cederlof has done extensive research 

 using twins to study health problemSV'-As we mentioned previously, one 

 prcbiem in determining the cause of hcartf disease is the many factors 

 Involved^ Py using twins, one of -.vhom smok%> and the other does not. 



Professor Ceierlof can control such factors as rrrt,^ag«, sex and, more 



importantly, genk^(tc make-up. In recent years, he harfe«moloy«J this 



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technique to s^udy hea^and other diseases from the standf^pl ofJh«ir 



relationship to Smoking. K^has conducted studies in Sweden injjjlvinf 



20,000 t'.vins and just recently Aijiplcted a study of 14,744 tv.ins in the 



ioll^e 





 U.S. . working in conjunctioH^|th tfvi?>.'ational Institute of Health and the \, 



American Medical Association.^ *"?^ 



In his statement to Congress. Dr.^-Cederlof said that his vork 



with non-smoking and smoking twins indicated thaV-the association between 



smoking and some symptoms of heart disease may be -jtajtrely statistical 



and not causal. He also observed— and this is extremely l«J»j;resting — 



that in a study of 3, 656 pairs of identical twins no "higher mcrt^lity among 



C ■ * 



the smoking twins" was found. '^/^ " ^ 



Scientists have reviewed t.vin studies and regard them hlg.'.ly.'T 



Dr. Joshua Burn, who is the former Head of the Department of 



Pharmacology, Oxford University. England, in discussing tv-in studies. 



