Why do people use electronic nicotine delivery systems (electronic cigarettes)? A content analysis of Twitter, 2012-2015

• John W. Ayers ,

  * E-mail: ayers.john.w@gmail.com

  Affiliation Graduate School of Public Health, San Diego State University, San Diego, California, United States of America

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• Eric C. Leas,

  Affiliation University of California San Diego School of Medicine, San Diego, California, United States of America

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• Jon-Patrick Allem,

  Affiliation Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America

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• Adrian Benton,

  Affiliations Department of Computer Science, Johns Hopkins University, Baltimore, Maryland, United States of America, Human Language Technology Center of Excellence, Johns Hopkins University, Baltimore, Maryland, United States of America

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• Mark Dredze,

  Affiliations Department of Computer Science, Johns Hopkins University, Baltimore, Maryland, United States of America, Human Language Technology Center of Excellence, Johns Hopkins University, Baltimore, Maryland, United States of America, Bloomberg LP, New York, New York, United States of America

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• Benjamin M. Althouse,

  Affiliations Institute for Disease Modeling, Bellevue, Washington, United States of America, Santa Fe Institute, Santa Fe, New Mexico, United States of America, New Mexico State University, Las Cruces, New Mexico, United States of America

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• Tess B. Cruz,

  Affiliation Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America

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• Jennifer B. Unger

  Affiliation Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America

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