Koffing are thin skinned, inflatable creatures filled with toxic gases. The poisonous gases within a Koffing are lighter than air, and cause them to float everywhere they go. Koffing may be related to Beholders, but they have no eye related powers and smell really bad. Koffing are known to frequent places that smell very bad on their own accounts, and it is believed that Koffing collect foul smells to be used later.