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Research Letter |

Circaseptan (Weekly) Rhythms in Smoking Cessation Considerations

John W. Ayers, PhD, MA1; Benjamin M. Althouse, ScM, PhD2; Morgan Johnson, MPH3; Joanna E. Cohen, MHSc, PhD4
[+] Author Affiliations
1Graduate School of Public Health, San Diego State University, San Diego, California
2The Santa Fe Institute, Santa Fe, New Mexico
3The Monday Campaigns, New York, New York
4Institute for Global Tobacco Control, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
JAMA Intern Med. 2014;174(1):146-148. doi:10.1001/jamainternmed.2013.11933.
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Smokers’ rhythms in contemplating quitting or making quit attempts are poorly understood. Tobacco control has focused on annual events (eg, New Year’s Day), but circaseptan (weekly) time cycles may likewise exist. For example, many illnesses such as strokes are more common on Mondays.1 Do cessation behaviors also have weekly rhythms?

Article InformationCorresponding Author: John W. Ayers, PhD, MA, Graduate School of Public Health, San Diego State University, 9245 Sky Park Ct, Ste 230, San Diego, CA 92123 (ayers.john.w@gmail.com).

Published Online: October 28, 2013. doi:10.1001/jamainternmed.2013.11933.

Author Contributions: Dr Ayers had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

Study concept and design: Ayers, Althouse, Johnson, Cohen.

Acquisition of data: Ayers, Althouse.

Analysis and interpretation of data: Ayers, Althouse, Cohen.

Drafting of the manuscript: Ayers, Althouse.

Critical revision of the manuscript for important intellectual content: Ayers, Althouse, Johnson, Cohen.

Statistical analysis: Ayers, Althouse.

Obtained funding: Cohen.

Administrative, technical, or material support: Althouse, Johnson.

Study supervision: Cohen.

Conflict of Interest Disclosures: Drs Ayers and Althouse share an equity stake in a consulting group, Directing Medicine LLC, that helps public health investigators implement some of the ideas embodied in this work. The data generation procedures, however, rely on public archives. There are no other reported conflicts of interest.

Funding/Support: This work was supported through a cooperative agreement between the Monday Campaigns and the Johns Hopkins Bloomberg School of Public Health. Dr Ayers also acknowledges the support of the National Cancer Institute (RCA173299A).

Role of the Sponsors: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.

Additional Contributions: We thank Andy Keller, BS, and Rachel Althouse, BA, for help with translation. We thank Keith Schnakenberg, MA, and Mauricio Santilliana, PhD, MSc, for advice on data modeling.

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Daily Trends in Smoking Cessation Google Queries

The main panels in each graph show segments of the weekly trend lines (light blue curves) for searches in the indicated languages from 2008 to 2012 layered over one another, with the mean for each day of the week, as estimated from the wavelet-reconstructed time series, indicated by an open diamond; reference lines (dashed lines) for the Monday means were added to aid interpretation. In the bottom portion of each panel is illustrated the Google search volume for Monday (open diamonds) relative to the combined Tuesday through Thursday means; horizontal error bars represent the 95% CIs. Smoking cessation volume on each graph is represented as a relative search volume (ie, a normalized daily ratio of cessation queries to all queries).

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