A quick google search including pre-eclampsia and paternal immunological tolerance will explain this one for those who are lost. The alt-text is a reference to the fact that smoking has also been shown to prevent both pre-eclampsia and gestational hypertension. Of course, this would be terrible advice as the dangers of smoking are far greater.

Title: Pre-eclampsia

David: “Honey, I’m so excited to start our family. But I think we should take all steps necessary to mitigate the risk of this thing called pre-eclampsia. It’s relatively common, but pretty dangerous.”

Wife: “Aww babe! You’re so thoughtful!”

Text: Of course David had an ulterior motive.