In the United States, there are more than 47 million people over 18 who smoke and nearly 45 million former smokers, according to CDC statistics. After the age of 30, lungs stop growing and lung function begins to diminish. Non-smokers lose lung function at a rate of about 20 cubic centimeters per year. Smokers lose about 4-5 times that much and can exhale about 100 cubic centimeters less air. Definitely not true.
People can develop lungs long after age thirty.
This refutes the earlier statement that it is lost. Most people I have spoken with that quit smoking just suddenly decided to quit and then QUIT . When one does not breathe properly one gets much of the sense of deeper relaxing and energizing breathing from the way they breathe while inhaling and the nicotine. But doctors need to do more, one expert said. If you're talking to a teenage boy, tell him smoking will make him impotent.