Stanford University MATRICES project

The MATRICES project, funded by the National Cancer Institute and sponsored by Stanford University, aims to get a snapshot of tobacco, vaping, and marijuana use among California's public college students. Stanford has contracted with NORC at the University of Chicago to support the institutional recruiting and a student survey.

JUUL, Natural American Spirit, and edibles are sold online and in local stores. Nationally, 1 in 3 college students still use tobacco; use of vapes is even higher; and marijuana use among young adults is the highest rate it has been in 35 years.

California was the second state to raise the minimum legal age to purchase tobacco from 18 to 21. California is also among the growing number of US states to legalize recreational use of marijuana, with retail sales that began in 2018.

Details of the MATRICES project work schedule are as follows:

  • Fall 2018 – Questionnaire and sample design, piloting
  • Spring 2019 – Sample frame building and sample selection
  • Fall 2019 - Spring 2020 – (First round)
  • Winter 2020 – First study results
  • Fall 2020 – Data collection (Second round)
  • Summer 2021 – Second study results

The project will conduct web-based data collection featuring an embedded mapping tool.

Participating universities and colleges will receive summary reports for their campus or district relative to their overall system (i.e., California Community College System, California State University, University of California). This summary may inform health services, student advocacy, and enhancements to tobacco-free campus policies.

Recent Publications

Barker DC, Schleicher NS, Ababseh K, Johnson TO, Henriksen L (In Press). ENDS retailers and marketing near university campuses with and without tobacco-free policies. Tobacco Induced Disease.

Vogel, E. A., Rubinstein, M. L., Prochaska, J. J., & Ramo, D. E. (2018). Associations between marijuana use and tobacco cessation outcomes in young adults. Journal of Substance Abuse Treatment; 94, 69-73.

Ramo DE, Thrul J, Delucchi KL, Hall SM, Ling, PM, Belohlavek A, Prochaska JJ. (2018). A randomized controlled evaluation of the tobacco status project, a Facebook intervention for young adults. Addiction. 2018 May 24. [Epub ahead of print]

Henriksen, L., Schleicher, N. C., Ababseh, K., Johnson, T. O., & Fortmann, S. P. (2017). Marijuana as a ‘concept’ flavour for cigar products: availability and price near California schools. Tob Control; 27(5):585-588.

Epperson AE, Henriksen L, Prochaska JJ. (2017). Natural American Spirit brand marketing casts health halo around smoking. Am J Public Health; 107(5):668-670.

Epperson AE, Prochaska JJ, Henriksen L. (2017). The flip side of Natural American Spirit: corporate social responsibility advertising. Tob Control;27(3):355-356. doi: 10.1136/tobaccocontrol-2016-053576.

Principal Investigators

Dr. Lisa Henriksen
Stanford University

Dr. Judith Prochaska
Stanford University


Trent Johnson
Program Manager
(650) 723-0059

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