STATEENT John P Wyett , A-D. Wyett, Profeebor end Chafrman of Departuent John P the of Path- ology , UnIverbity of HanIcoba . remarks the difffcultfee concero Ln deternfning Involved che causa l background8 of che chronic reb - PIratory diseage8 PartIcularly bronchitib and emphysema . basfe for attributing opInfon, chere major cauga] role to cIgarette smoking . these conditions ownInvegtigationg begInning with obeervatLone of the effects distinctive lung Pollutants In 8fl1c0818 buch and the soft coa [ lung of Southern Illnols orkers coe [ ffeldb and the more bIva lent fleld8 naturally occurIng emphybeme hag progressvely the condition called trengthened my be lef chat emphysema the regult of multiple 4nd terlned yet unde caubeb centrflobular emphysema publighed origIna 1 InvestIgatfon Into In 1960 , streased thet the nature the Plgmented material found lung Ike ly re flection afr Pollutfon the of Industrial and the dirty PogsIbly aleo of a[r Loule the  1930 fev years  later ve lung chat demonstrated by chenicel ana Ly8 [8 dama 'Bed could tIngly , entrap agente currently contique the air. Intereg found In guch lunge evidence of Strontium 90 , which vag demonstrated I be  fallout from atomic bonb testing 1960 did fInd not these   lungs evidence of componente of cigarette any 8moke _
STATEENT John P Wyett , A-D. John P Wyett, Profeebor end Chafrman of the Departuent of Path- ology , UnIverbity of HanIcoba . remarks concero the difffcultfee Involved Ln deternfning che causa l background8 of che chronic reb - PIratory diseage8 PartIcularly bronchitib and emphysema . basfe for attributing major cauga] role opInfon, chere these conditions to cIgarette smoking . ownInvegtigationg begInning with obeervatLone of the effects distinctive lung Pollutants buch In 8fl1c0818 and the soft coa [ orkers lung of Southern Illnols coe [ ffeldb and the more bIva lent fleld8 naturally occurIng emphybeme hag progressvely trengthened my be lef chat the condition called emphysema the regult of multiple 4nd yet unde terlned caubeb origIna 1 InvestIgatfon Into centrflobular emphysema publighed In 1960 , streased thet the nature the Plgmented material found the lung Ike ly re flection of Industrial afr Pollutfon and PogsIbly aleo of the dirty a[r Loule the  1930 fev years  later ve demonstrated by chenicel ana Ly8 [8 chat dama 'Bed lung could contique the air. Intereg tIngly , entrap agente currently found evidence In guch lunge of Strontium 90 , which vag demonstrated be  fallout from atomic bonb testing 1960 did not fInd these   lungs any evidence of componente of cigarette 8moke _ I