Percentage of income spent on tobacco and intention to quit: a cross-sectional analysis of the JASTIS 2020 study.

"Declarations Ethics approval and consent to participateThe study was reviewed and approved by the Research Ethics Committee of the Osaka International Cancer Institute (no. 1412175183) and the National Institute of Public Health (NIPH-IBRA#12112). Informed consent statementWe obtained web-based informed consent from all the respondents whose data from the JASTIS study were used in our research. Consent for publicationNot applicable. Availability of data and materialsThe data used in this study are not available in a public repository because they contain personally identifiable or potentially sensitive participants’ information. Based on the regulations for ethical guidelines in Japan, the Research Ethics Committee of the Osaka International Cancer Institute has imposed restrictions on the dissemination of the data collected in this study. All data inquiries will be channeled through Tabuchi (moc.liamg@katihcubat) to Osaka Cancer Institute Institutional Ethics Committee. Competing interestsThe authors declare that they have no competing interests. FundingThe study is supported by Health Labour Sciences Research Grants (20FA1005; 19FA0501; 19FA2001; and 19FA1011) and the Japan Society for the Promotion of Science (JSPS) KAKENHI Grants (18H03062; 21H04856). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Authors’ contributionsMT: Conceptualization; formal analysis; methodology; project administration; software; validation; visualization; writing – original draft preparation; writing – review & editing. TT: Conceptualization; data curation; funding acquisition; investigation; methodology; project administration; resources; software; supervision; validation; visualization; writing – review & editing. HI: Conceptualization; supervision; visualization; writing – review & editing.All authors have approved the final article. AcknowledgementsThe authors thank Dr Julia Mortimer for her English language editing. Competing interests The authors declare that they have no competing interests."

"Funding The study is supported by Health Labour Sciences Research Grants (20FA1005; 19FA0501; 19FA2001; and 19FA1011) and the Japan Society for the Promotion of Science (JSPS) KAKENHI Grants (18H03062; 21H04856). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript."