Tobacco and marijuana use during the COVID-19 pandemic lockdown among American Indians residing in California and Oklahoma.

"CONFLICTS OF INTEREST The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none was reported."

"FUNDING This project was supported by grant P30CA225520 and P30CA093373 from the National Cancer Institute. First author is supported by grant 1K01CA258956-01A1, 5K12HD051958-17, and P30CA93373. Second author is partially supported by grant P30CA225520 from the National Institutes of Health and the University of Oklahoma Shared Clinical and Translational Resources (U54GM104938) with an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences. The Fifth author is supported by P30CA093373. Last author is supported by P30CA225520. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health."