This is the peer reviewed version of the following article: Walker, N., Bullen, C., Barnes, J., McRobbie, H., Tutka, P., Raw, M., Etter, J. -F., Siddiqi, K., Courtney, R. J., Castaldelli-Maia, J. M., Selby, P., Sheridan, J., and Rigotti, N. A. (2016) Getting cytisine licensed for use world-wide: a call to action. Addiction, 111: 1895–1898. doi: 10.1111/add.13464. which has been published in final form at https://dx.doi.org/10.1111/add.13464 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.