In a recent study, it has been found that girls born to the mothers who smoke during pregnancy will exhibit signs of increased testosterone exposure, which may affect their hormone and reproductive function in future. The findings of this study suggest that smoking is an endocrine disruptor that can masculinise girls in the womb and that daughter of women that smoked during pregnancy may suffer from hormonal and reproductive health problems in the long-term. Smoking during pregnancy is widely considered bad for the health both for the mother and baby, yet some women persist and many are exposed to passive smoking. In addition to the many toxins present in cigarette smoke, it is also suspected of having endocrine-disrupting properties that may increase testosterone levels. Baby girls exposed to higher levels of the male hormone, testosterone, in the womb are at greater risk of abnormal development and long-term negative effects on their fertility and metabolism. In order to understand the study better, the team now plans to monitor the long-term effects of exposure to higher testosterone levels caused by smoke exposure in the same group of baby girls, to assess how this may affect their future health and fertility.