Exploring the substitution of cannabis for alcohol and other drugs among a large convenience sample of people who use cannabis

Abstract Background: The substitution of cannabis for alcohol and other drugs has been conceptualised in a harm reduction framework as where cannabis is used to reduce the negative side-effects, addiction potential, and social stigma of other drugs. There is currently mixed evidence with recent reviews suggesting cannabis co-use patterns may vary by age and ethnicity. Yet few studies have had large enough samples to examine this demographic variation in detail. Aims: To explore the co-use of cannabis with alcohol and