A new report finds that nine of 10 "crib death" cases involve babies born to mothers who smoked during pregnancy, the Independent reported Oct. 14.

British researchers say that women who smoke during pregnancy face four times the risk of Sudden Infant Death Syndrome (SIDS) as nonsmokers. The findings were based on a review of 21 previously published studies by researchers at Bristol University's Institute of Child Life and Health.

Authors Peter Fleming and Peter Blair said that governments should consider smoking during pregnancy or at home when infants are present as "antisocial, potentially dangerous, and unacceptable." They also suggested that access to tobacco may need to be restricted for pregnant women.

"Given the power that tobacco addiction holds over its victims, there is grave concern as to whether it will be a successfully modifiable risk factor without fundamental changes in tobacco availability to vulnerable individuals," they wrote.