What distinguishes the harm of smoking parents to the child in the womb and after birth?

Swedish scientists have for the first time were the difference between the influence of parental smoking on the unborn child, and second-hand smoke after birth explain. Researchers at the Institute in Stockholm conducted a study, which means that if the parents smoke during pregnancy doubles the risk of asthma in children exposed to the age of 4. In return, if the child lives in a house with smoke, the child is at risk of allergic reactions. Scientists are not taken, call the exact numbers, but many of the children who develop allergies as a result of passive smoking, finally. Also cause chronic asthma Although the risk of developing lower with children who are affected by parental smoking before birth compared. Such conclusions, the experts on the basis of the study "BAMS" made - one of the largest studies in the world, which was attended by four thousand children from Stockholm.