Cilmi-baaristii ugu dambeysay iyo falanqeyntii cilmi-baarista wadnaha ee Framingham ee ay sameeyeen cilmi-baarayaal ka tirsan Xarunta Caafimaadka ee Jaamacadda Vanderbilt waxay soo jeedinayaan in halista kansarka sanbabada ay aad u korodhay 5 sano gudahood marka la joojiyo sigaarka. Maalinta joojinta tubaakada aduunka ayaa laga xusay aduunka oo dhan, iyadoo la eegayo waxyeelada sigaarka. Waxaa xusid mudan, sigaar cabbiddu waxay saamaysaa ku dhawaad 100ka nooc ee kansarka ee bini'aadamka. Machadka Qaranka ee Wadnaha, Sambabada, iyo Dhiiga ayaa taageeray daraasaddan, taas oo gacan ka gaysatay in lagu ogaado dhiig karka iyo kolestaroolka sare ee khatarta ugu weyn ee cudurada wadnaha. Laakiin sidoo kale waa la dabagalay natiijooyinka kansarka.
Daraasadda hadda jirta waxay eegtay 8,907 kaqeybgalayaasha kuwaas oo la socday 25 ilaa 34 sano. Inta lagu jiro muddadan, 284 kansarka sanbabada ayaa la ogaaday, ku dhawaad 93 boqolkiiba kuwaas oo ka dhex dhacay dadka sigaarka cabba, kuwa cabbay ugu yaraan baakidh sigaar ah maalintii 21 sano ama ka badan. Shan sano ka dib joojinta, khatarta ah inuu ku dhaco kansarka sanbabada ee sigaar cabbi jiray hore ayaa hoos u dhacay 39 boqolkiiba marka loo eego kuwa hadda sigaarka cabba, waxayna sii waday inay hoos u dhacdo wakhtigu wuu socday. Haddana xitaa 25 sano ka dib joojinta, kansarka sanbabada Khatarta ayaa weli ah in ka badan saddex laab marka loo eego dadka oo aan waligood sigaar cabbin.
Waxaan rajeynayaa in daraasaddan cusub ay ku dhiirigeliso dadka inay joojiyaan sigaarka sida ugu dhakhsaha badan. Aan isku nimaadno oo aan ballan qaadno maalintan joojinta tubaakada adduunka si aan dadka sigaarka cabba uga wacyigelinno dhibaatooyinka sigaarka.
