I agree with the no comments. I can see the guy now who smokes a cade, then breaks it and say I didnn't see it was a cade because of the smoke. It also would stop someone from seeing the person who is shooting your cade in. Use Beachstrike as an example. In the cage room 1 or 2 smoke grenades would make it so that you couldn't see the other small room across from you. Then when someone from across the way shoots at a zom, they are probally going to shoot your cade and have no idea they are doing it.