Another way of understanding and explain marijuana use within skateboarding culture, would be through the routine activity theory that Johns used in her dissertation. Despite her not finding a higher amount of substance use among skateboarders than other subcultures, she did find an increased amount of substance use among the older informants in the 12th grade. As mentioned in earlier, this would match the findings of Demant & Järvinen, and the routine activity theory may therefore be able to find an explanation of why older adolescents are likely to engage in substance use more generally. This may be because older adolescents are more likely to be without parental supervision, or spend more of their time in an unstructured manner since they
