Smoking and vaping patterns during pregnancy and the postpartum: A longitudinal UK cohort survey.

"appendix a supplementary data the following are the supplementary data to this article: supplementary data 1 supplementary data 2 supplementary data 3 supplementary data 4 acknowledgements the authors would like to thank all participants and staff at the nhs hospitals who were involved in this study."

"Declaration of Competing Interest Dr Hayden McRobbie has in the past 3 years received honoraria for speaking at smoking cessation meetings and attending advisory board meetings that have been organised by Pfizer. He has no relationships with the manufacturers of vaping products. All other authors declare that they have no conflicts of interest."

"Funding This work was funded by Cancer Research UK (CRUK), Tobacco Advisory Group Project (Grant number C53479/A22733). CRUK had no role in the study design, collection, analysis or interpretation of the data, writing the manuscript, or the decision to submit the paper for publication."