[release]This is just my old poison mod, Poison headcrabs, zombies and antlion workers will poison you, Giving you damage overtime instead of just giving you 1 hp.
1 Entity that places gas in the entitys spawn area, Forbiding people to go into that area without being poisoned, The entitys poison lasts about 1.25X longer than npc poison.
Client-Side: Poison_Effect 0 or 1 -- This disables the green overlay if 0
Server-Side: Poison_Enabled 0 or 1 -- Set to 0 and this should stop poison taking effect on players from NPCS -- Poison_Sound 0 or 1 -- Set to 0 and this should stop players coughing while poisoned
Please take note that this is just an old addon i dont think i ever got around to releasing.