The nicotine inhalator is available as Nicorette® 15 mg Inhalator (each pack contains a plastic tube and 20 cartridges).
This is a plastic tube with a nicotine capsule inside it. So when you puff on it, the air flows through the capsule and brings nicotine into your mouth. You can hold it like a cigarette so it's useful for keeping your hands busy.
Image credit: StartRightNRT