Washington: Thirdhand smoke-the noxious residue that clings to virtually all surfaces long after the secondhand smoke from a cigarette has cleared out-causes significant genetic damage in human cells, a study has found.The study led by researchers from Lawrence Berkeley National Laboratory also found that chronic exposure is worse than acute exposure, with the chemical compounds in samples exposed to chronic thirdhand smoke existing in higher concentrations and causing more DNA damage than samples exposed to acute thirdhand smoke, suggesting that the residue becomes more harmful over time.
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