Footnotes

• Contributors All authors listed on this manuscript confirm that they fulfil the criteria of authorship as outlined in the uniform requirements for manuscripts submitted to medical journals. Thus, all named authors have made substantial contribution to the following: conception and design, acquisition of data or analysis and interpretation of data, drafting the article or revising it critically for important intellectual content and final approval of the version published.

• Funding RB has received grants from pharmaceutical companies, government and non-government agencies that produce smoking cessation products.

• Competing interests None.

• Ethics approval Sydney Local Health District Ethics Review Committee (RPA Zone).

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