Another useful model for understanding the nature and extent of drug-related difficulties is one which considers the actual nature of the difficulties experienced. While Thorley's model looks at patterns of use and related problems, the Four L's model, (adapted by Roizen) considers the impact of drug use on four major spheres a young person's life. These are as follows:
- Liver: Anything to do with a person's health including physical, psychological or emotional health problems
- Lover: Problems associated with a person's relationships, family, friends, children, lovers etc.
- Lifestyle/livelihood: Problems which relate accommodation, work, finances, education, recreation etc.
- Legal: Any problems associated with the law including criminal or civil proceedings.