gas grenades

code/game/objects/items/explosives/grenades/marines.dm

@@ -465,6 +465,45 @@
 	icon_state = "grenade_phos_clf"
 	item_state = "grenade_phos_clf"
 
+/*
+//================================================
+			Nerve Gas Grenades
+//================================================
+*/
+/obj/item/explosive/grenade/nerve_gas
+	name = "\improper CN20 canister grenade"
+	desc = "A canister grenade of deadly nerve gas. It is set to detonate in 4 seconds."
+	icon_state = "flashbang2"//temp icon
+	det_time = 40
+	item_state = "grenade_phos_clf"//temp icon
+	underslug_launchable = FALSE
+	harmful = TRUE
+	antigrief_protection = TRUE
+	var/datum/effect_system/smoke_spread/cn20/nerve_gas
+	var/nerve_gas_radius = 2
+
+/obj/item/explosive/grenade/nerve_gas/New()
+	..()
+	nerve_gas = new /datum/effect_system/smoke_spread/cn20
+	nerve_gas.attach(src)
+
+/obj/item/explosive/grenade/nerve_gas/Destroy()
+	QDEL_NULL(nerve_gas)
+	return ..()
+
+/obj/item/explosive/grenade/nerve_gas/prime()
+	playsound(src.loc, 'sound/effects/smoke.ogg', 25, 1, 4)
+	nerve_gas.set_up(nerve_gas_radius, 0, get_turf(src), null, 6)
+	nerve_gas.start()
+	qdel(src)
+
+/obj/item/explosive/grenade/nerve_gas/xeno
+	name = "\improper CN20-X canister grenade"
+
+/obj/item/explosive/grenade/nerve_gas/xeno/New()
+	nerve_gas = new /datum/effect_system/smoke_spread/cn20/xeno
+	nerve_gas.attach(src)
+
 /*
 //================================================
 			Airburst Smoke Grenades