Testing Warning Labels for Retail Cannabis Products Using a Discrete Choice Experiment

The DCE will be conducted via a self-administered online questionnaire, with inclusion criteria assessed before assignment to choice set conditions. Participants will be residents of legal-retail cannabis use states, able to legally purchase cannabis (21 or older), who have used cannabis in the past 30 days (i.e., current use). Frequency of cannabis use (i.e., monthly, weekly, daily), mode (e.g., flower, vape, etc.), and dose (i.e., THC level) will be measured through self-report. Inclusion criteria are reported using cannabis (any mode) in the past 30 days. Consented participants will be presented with descriptions of cannabis packaging attributes and an example choice set to become familiar with DCE tasks. Participants will be asked to imagine the cannabis products in the DCE as the only choices they have available to them "in the near future" and to evaluate images within this scenario. Participants will be randomly assigned to view 16 choice sets. To optimize the evaluation of preferences and reduce respondent burden, we will assign contrasting labels to "choice sets," each of which will include 4 images of products in such a way that each attribute level appears an equal number of times in combination with all other attribute levels. Presentation order of the 16 choice sets will be randomized within and across choice sets to minimize ordering effects. Participants will view each choice set for as long as they wish. After evaluating choice sets, participants will complete a recall task to assess retention of health warning information and will be provided a debrief page with information about substance use and resources for seeking help with substance use.