In the less than two years since retaking power in Afghanistan, the Taliban has managed to cut opium poppy cultivation by almost 90%. On the surface, it’s a big achievement but it’s left many Afghans without a way to make a living and could cause a negative ripple effect: an increase in the global flow of fentanyl. Marco Werman speaks with Vanda Felbab-Brown, director of The Initiative on Nonstate Armed Actors, and a senior fellow at the Brookings Institution.