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In what they call the largest study ever done, researchers found using marijuana while pregnant may increase the risk that a child will develop autism. "Women who used cannabis during pregnancy were 1.5 times more likely to have a child with autism," said study author Dr. Darine El-Chaâr, a maternal fetal medicine specialist and clinical investigator at Ottawa Hospital Research Institute in Canada. "These are not reassuring findings. We highly discourage use of cannabis during pregnancy and breastfeeding," she said.