We inhale/exhale almost 3/4 billion times during our lives. Each breath you take puts your internal world in intimate contact with the external world. Keep lungs healthy by saying “no” to smoking, staying out of polluted environments and getting plenty of physical activity. Comes with two free black lungs in each pack of natural pink. (7/8" tall). Promote healthy habits in your elementary students with the Lungs incentive reward. Promote healthy habits in your elementary students with the Lungs incentive reward.