Is there self-regulation or self monitoring test. I am interested in measuring why people are not commited to their goals (quit smoking, dieting etc) so you can suggest another measure instead of self-regulation failure.
You could look at the Self-Regulation Questionnaire. See here for a summary of the instrument in terms of what it purports measure, items, response scales, psychometric properties such as reliability and validity.
Brown, J. M., Miller, W. R., & Lawendowski, L. A. (1999). The Self-Regulation Questionnaire. In L. VandeCreek & T. L. Jackson (Eds.), Innovations in clinical practice: A source book (Vol. 17, pp. 281-289). Sarasota, FL: Professional Resource Press.
You can also use a stop signal task that measure response inhibition. It has been associated with dependencies like smoking http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3077266/ and http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0018898 for a go/nogo task, though the stop signal task is preferred. There is also some studies linking inhibtion to self regulation and self control, although I dont remember the sources at the moment. Sorry for poor formatting, new here at s.e.
Also consider more fundamental personality differences such as Conscientiousness, "...the personality trait of being careful, or vigilant. Conscientiousness implies a desire to do a task well, and to take obligations to others seriously. Conscientious people tend to be efficient and organized as opposed to easy-going and disorderly. They exhibit a tendency to show self-discipline, act dutifully, and aim for achievement; they display planned rather than spontaneous behavior; and they are generally dependable." https://en.wikipedia.org/wiki/Conscientiousness
It can be measured along with other major personality factors in the Big Five Inventory (BFI): https://www.ocf.berkeley.edu/~johnlab/bfi.htm