The study, which was carried in the journal Menopause, pooled data from several previous studies that included about 6,000 women in the United States, Poland, Turkey and Iran.
Non-smokers hit menopause between age 46 and 51, on average. But in all but two of the studies, smokers were younger when they hit menopause, between 43 and 50 overall.
During menopause, a woman's ovaries stop producing eggs and she can no longer get pregnant.
"Our results give further evidence that smoking is significantly associated with earlier (age at menopause) and provide yet another justification for women to avoid this habit," wrote study author Volodymyr Dvornyk, from the University of Hong Kong.
Dvornyk and his colleagues also analysed five other studies that used a cut-off age of 50 or 51 to group women into "early" and "late" menopause. Out of more than 43,000 women in that analysis, women who smoked were 43 percent more likely than nonsmokers to have early menopause.
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We are Praying to Allah for protecting from smoking.
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