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Cigarette package colour is associated with level of filter ventilation

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  • Acknowledgements The authors would like to acknowledge Jessica Reid and Sara Zukowski for their assistance with data collection and coding.

  • Contributors RJO and DH designed the study and contributed to data collection. RJO conducted data analysis and prepared the first draft. RJO and DH contributed to revising the manuscript.

  • Funding This work was supported by a grant from the US National Cancer Institute (P01 CA138389). Additional funding was provided to DH through a Chair in Applied Public Health, funded by the Public Health Agency of Canada in partnership with the Canadian Institutes of Health Research Institute of Neurosciences, Mental Health and Addiction, and Institute of Population and Public Health.

  • Competing interests DH has provided paid expert testimony on behalf of public health authorities in response to legal challenges from the tobacco industry, including on packaging and labelling regulations.

  • Provenance and peer review Not commissioned; externally peer reviewed.