im pretty sure it works like a gravity/waterfall but with out the water... you light the weed and pull down on the bag and it creates pressure pulling the smoke in, then you inhale i guess... idk i never seen one either but it looks like thats what it would be for
TheFlu Reviewed by TheFlu on . Lung I made instead of doing Spanish homework Got bored while trying to learn another tongue..so I made a lung:thumbsup: Rips pretty hard. Rating: 5