In this paper, the interview guide is not given, but it might be worth contacting the authors about it (on ResearchGate):
Uppal, N., Shahab, L., Britton, J., & Ratschen, E. (2013). The forgotten smoker: a qualitative study of attitudes towards smoking, quitting, and tobacco control policies among continuing smokers. BMC public health, 13(1), 432.
Thank you for providing an appropriate suggestion of how to get hold of the questionnaires. I have tried contacting one of the authors but there has not been a response yet.
This article uses the "Stages of Change" model and compares it to single question. They use them to predict Non-smoking, but it does provide the questions to assess stage of change.
Published online 2014 Oct 1. doi: 10.2147/PPA.S67767
PMCID: PMC4199752
Motivations toward smoking cessation, reasons for relapse, and modes of quitting: results from a qualitative study among former and current smokers
Krzysztof Buczkowski,1 Ludmila Marcinowicz,2 Slawomir Czachowski,1 and Elwira Piszczek3
The study reports on smoking-cessation modes and the most common spontaneous decision, caused by a particular trigger factor. The study highlights that people living and working with smokers should constantly motivate them to quit, because it is not known when the right moment for smoking cessation is. We have look for the moment when the smoker decides to quit. The relapse causes also an important issue. In the study talk s about stress, lack of the pleasure previously obtained from smoking, and the smoking environment. An attempt to motivate the person that relapse may take place one should not get dishearten and relapse prevention can be to enhance the number of successful smoking cessation attempts.