The study was conducted by researchers at the University of Colorado, Denver, and involved data on more than 53,000 Americans who were either current or former heavy smokers.
Baadhitaanka ayaa waxa sameeyay cilmi baarayaasha jaamacada University of Colorado, ee magaalada Denver, iyagoo xogta ka uruuriyay in ka badan 53,000 American ah oo ahaa kuwa hadda ama mar hore sigaarka cabi jiray.