Researchers at the University of Colorado, Denver gathered data on over 53,000 Americans, all of whom were current smokers 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.