Yes, that's one strong benefit they have over chemical weapons, which are basically always going to leak given time, or biological agents, which can be smuggled

Yes, that's one strong benefit they have over chemical weapons, which are basically always going to leak given time, or biological agents, which can be smuggled in a human incubator. The downside of nukes almost exclusively has to do with when they work as intended... otherwise they really are impressive products of engineering.