Due to the structure of our model (described below), we applied a number of contingencies to the coding of the data. Participants were scored for regular tobacco use only if they positively endorsed the question regarding initiation, and set to missing otherwise. Dependence scores were assigned only if the participant was scored positively as a regular tobacco user, and scores were assigned separately for each product (i.e. an individual using both cigarettes and snus regularly was assigned a separate dependence score for each method of administration).
