Wouldn’t be too hard, could 'a’pply poisons to thrown objects, and that would stash a dose in the weapon, then on impact it could try to apply the effect.
I’m sure we could come up with zombie/triffid(roundup lol)/fungus specific poisions, with the benefit that they might not even be dangerous to the player.
The whole thing is a BIIIG can o’ worms though, application to thrown and melee weapons is probably the main immediate application* (though you could use poisoned bait once we have critters eating things), and some canned poisons, but then we’ll want recipes, and 11 secret herbs and spices to make the various poisons, and have them spawning all over, and cultivating them, and more chemistry stuff, etc…
Huh, that paragraph was SUPPOSED to be reasons not to do it, but had the opposite effect, now I want to do it more.
*Ranged guys would get some love too, I’m sure we’d add a tranq gun, and load up the syringes with more fun stuff.