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(1)__________ we have scientific evidence that women should not smoke when they are pregnant, many future mothers ignore this danger. These mothers endanger the physical health of their babies. (2) __________, they could be contributing to even more problems in the future. (3) __________ the known problems, recent studies have linked mothers’ smoking during their pregnancy with sons who go on to become criminals. Researchers in Finland followed over 5000 males and their mothers from the time the mothers were six months pregnant until the young men
were 28 years old. (4) __________ sons whose mothers did not smoke during pregnancy, those young men whose birth mothers did smoke were more than twice as likely to commit criminal acts. The researchers theorized that smoking during pregnancy may alter the chemical balance in the baby’s brain. This recent information, added to the body of evidence available for years, should be a warning to pregnant women to give up smoking.

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