Associations between dual use of e-cigarettes and smoking cessation: A prospective study of smokers in England.

"appendix a supplementary data the following are the supplementary data to this article: supplementary data 1 supplementary data 2 appendix a supplementary data to this article can be found online at https://doi org/10 1016/j addbeh 2019 106230 ."

"Declaration of Competing Interest JB has received unrestricted research funding to study smoking cessation from Pfizer, who manufacture smoking cessation medications. LS has received honoraria for talks, an unrestricted research grant and travel expenses to attend meetings and workshops from Pfizer, and has acted as paid reviewer for grant awarding bodies and as a paid consultant for health care companies. RW undertakes research and consultancy for and receives travel funds and hospitality from manufacturers of smoking cessation medications (Pfizer, GlaxoSmithKline and Johnson and Johnson). All authors declare no financial links with tobacco companies or e-cigarette manufacturers or their representatives."