Makes inventory slots forward clicks to items in them. In effect that means you don't have to pixelhunt item in the slot, just click the slot. Smoking cigs is easy mode now.

code/modules/mob/inventory.dm

@@ -1,7 +1,13 @@
 //This proc is called whenever someone clicks an inventory ui slot.
 /mob/proc/attack_ui(slot)
 	var/obj/item/W = get_active_hand()
-	if(istype(W))
+	var/obj/item/E = get_equipped_item(slot)
+	if (istype(E))
+		if(istype(W))
+			E.attackby(W,src)
+		else
+			E.attack_hand(src)
+	else
 		equip_to_slot_if_possible(W, slot)
 
 /mob/proc/put_in_any_hand_if_possible(obj/item/W as obj, del_on_fail = 0, disable_warning = 1, redraw_mob = 1)
@@ -186,7 +192,7 @@ var/list/slot_equipment_priority = list( \
 		wear_mask = null
 		update_inv_wear_mask(0)
 	return
-    
+
 /mob/proc/isEquipped(obj/item/I)
 	if(!I)
 		return 0