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Putting the effort in to quit smoking can improve the state of the immune system, and offer a chance for the lungs to clear out and regain some lost function

8 Barriers to quitting There are a number of barriers that make it difficult for people to stop smoking

More Information About this series The is the first of a three-part series examining the inner-workings of the Bureau of Alcohol, Tobacco, Firearms and Explosives

The names of the repository/repositories and accession number(s) can be found below: Ethics statement The studies involving human participants were reviewed and approved by the Ethics Committee of the First Affiliated Hospital of Nanjing Medical University