Smokers Lung is designed to give the players an understanding of what the lungs feel like of someone who smokes. Before allowing players to do this drill ensure none are on inhalers or may have any other medical condition which would be affected by difficulty breathing. Give each player a 6" drinking straw, like from McDonald's or somewhere, have each player line-up in a long line. Instruct the player to run a set distance only breathing in and out of their mouth, not through their nose with the straw in their mouth. The restriction of air they will feel is the same as someone who smokes. Monitor for any difficulties. Once the players experience the difficulty in breathing have them remove the straw and breath normally. I usually use this at the end of practice as an Alcohol and Tobacco Prevention note.