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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Cati Brown-Johnson conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, performed the computation work, reviewed drafts of the paper.

Donald Rubin conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding the deposition of related data:

Tobacco documents are available in their entirety here: http://legacy.library.ucsf.edu/.

The Tobacco Documents Corpus (a subset of the full tobacco documents library) is available here: http://www.tobaccodocs.uga.edu/.

Funding

This work was supported by the National Institute of Mental Health, Bethesda, Maryland, grant number #R01 MH083684 (PI Judith J. Prochaska); National Cancer Institute, Bethesda, Maryland, grants number CA-113710, R01 CA-87472 (PI Judith J. Prochaska), and R01 CA87490 (PI Donald L Rubin); National Institute on Drug Abuse, Bethesda, Maryland, grants number #K23 DA018691 and #P50 DA09253 (PI Judith J. Prochaska); NIH National Heart, Lung and Blood Institute, Bethesda, Maryland, grant #5T32 HL007034-39 (PI Christopher Gardner); and the State of California Tobacco-Related Disease Research Program, University of California Office of the President, Oakland, California grant number #21BT-0018 (PI Judith J. Prochaska). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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