https://www.pcgamer.com/new-vegas-mod-uses-dead-moneys-toxic-gas-to-create-some-very-lethal-grenades/

The best Fallout: New Vegas mods fill its casinos with NPCs, its thoroughfares with traffic, and its streets with new weapons. With the latter in mind, let me vouch for Cloud Grenades—a new project from Hopper31 that inserts the toxic gas clouds from New Vegas' Dead Money DLC into grenades. The results, as the header image above suggests, are predictably gruesome.   

Designed for those moments "when you want to kill someone as painfully as possible" (we've all been there, right?), Cloud Grenades turn the blood red noxious mist into a throwable bomb.