Allows the user to graphically demonstrate how the lungs come under attack from tobacco tar • Background explains some of the key effects of tar on the lungs • The lungs are like two giant sponges • Smokers' tar coats the trachea and lungs causing infections, long term damage and cancer • Pour the tar mix down the trachea and see how it coats the "sponge lungs" • Comes with trachea and lung tray, 2 sponge lungs and tar •  Can be washed and reused • Contains two replacement sponge lungs and tar