Was COVID-19 associated with increased cigarette purchasing, consumption, and smoking at home among US smokers in early 2020? Findings from the US arm of the International Tobacco Control (ITC) Four Country Smoking and Vaping Survey.

"appendix a supplementary data the following are the supplementary data to this article: supplementary data 1 appendix a supplementary data to this article can be found online at https://doi org/10 1016/j addbeh 2022 107276 ."

"Declaration of Competing Interest Geoffrey T. Fong has served as an expert witness on behalf of governments in litigation involving the tobacco industry. K. Michael Cummings has served as a paid expert witness in litigation filed against the cigarette industry. All other authors have no conflicts of interest to declare."

"Funding sources This study was supported by grants from the US National Cancer Institute (P01 CA200512) and the Canadian Institutes of Health Research (FDN-148477). GTF was also supported by the Ontario Institute for Cancer Research Senior Investigator Grant (IA-004), and the Canadian Cancer Society O. Harold Warwick Prize. None of the funders had any role in the study design, collection, analysis or interpretation of the data, writing the manuscript, or the decision to submit the paper for publication. CRediT authorship contribution statementPete Driezen: Conceptualization, Methodology, Formal analysis, Validation, Writing – original draft, Writing – review & editing. Karin A. Kasza: Conceptualization, Methodology, Formal analysis, Writing – review & editing. Shannon Gravely: Writing – review & editing. Mary E. Thompson: Funding acquisition, Conceptualization, Methodology, Writing – review & editing, Supervision. Geoffrey T. Fong: Funding acquisition, Resources, Writing – review & editing, Supervision. K. Michael Cummings: Funding acquisition, Writing – review & editing, Supervision. Andrew Hyland: Conceptualization, Writing – review & editing, Supervision."