Presently there is no specific test to follow these patients but in my opinion 3 scales may be interesting in your studty.
ASI score gives an overall assessment of the impact of addiction (in general Alcool, cocaïn but other drugs also) on the person (medical: somatic,psychological,financial,legal); it provides a profile of the severity of the addiction ("severity"rated from 1 to 9).
SF36 determite quality of life (in alcool dependence but also in the case of other drug use)