The Smoke Ball is an item in Super Smash Bros. Brawl. When thrown, it'll eject multicolored smoke, making for a large distraction. If you throw it towards an opponent, it won't deliver any damage but will stick to them, which will make it harder for them to see what they're doing.
"An item that activates when tossed and fills the area with clouds of obscuring smoke. The smoke slowly changes color over time, from white to yellow, orange, red, purple, and finally blue before restarting the cycle. The smoke hangs around quite a while before dispersing. You can pick up an active smoke ball and hurl it again. Be careful not to lose track of yourself, though."