“What about the children?” is a mantra that has been used to propel prohibition with misplaced fear. Scientists and politicians increasingly warn about the dangers of using cannabis during pregnancy. There’s only one issue: data doesn’t back them up. But a lack of evidence has never stopped the tides of prohibition. Unable to demonstrate that cannabis is actually harmful, public officials nevertheless warn that women are now more likely to report using cannabis during pregnancy (which partly reflects greater comfort talking to doctors, not greater use).