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Quitting smoking before and after varenicline: a population study based on two representative samples of US smokers
  1. Shu-Hong Zhu,
  2. Sharon E Cummins,
  3. Anthony C Gamst,
  4. Shiushing Wong,
  5. Tyson Ikeda
  1. Moores Cancer Center, University of California, San Diego, California, USA
  1. Correspondence to Dr Shu-Hong Zhu, Department of Family Medicine and Public Health, University of California, San Diego, 9500 Gilman Drive, MC 0905, La Jolla, CA 92093-0905, USA; szhu{at}

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