Our findings should be considered in light of 6 limitations. First, the SSAGA items had somewhat different methodological features across the three aggression types. For instance, some subscales asked participants about a wide range of aggressive acts whereas other subscales only asked about participation in “fights”. These sources of method-based variance might have amplified the distinctions we observed between these constructs. Future work should seek to replicate our work using measures with minimal methodological variance between categories. Second, our measure of drug-related aggression lumped together five different drug-types that were remarkably different from one another. Though each have been independently linked to aggressive acts, and all of them ultimately loaded onto the same factor, our results ignored the many meaningful differences between these different drugs. In the future, research should better articulate the similarities and differences in aggression between various types of drug misuse. Relatedly, our drug-related aggression measure excluded marijuana-related aggression. This was of less concern because marijuana misuse has been linked to lesser aggression (Myerscough & Taylor, 1985), yet this important and relatively frequent form of drug misuse
