3. Results
3.1. Characteristics of participants
Of the 227,117 individuals fulfilling the inclusion criteria, 60,804 (26.8%) reported being snus users. The vast majority of participants (N = 223,412, 98.4%) were aged 18 or 19 at the time of assessment. A full description of the characteristics of participants, including snus users and non-users, is provided in Table 1.