Nitrous oxide use was assessed by the question: “How many times did you use nitrous oxide in your life”. Answer options ranged from ‘never’, ‘once’, ‘twice’, ‘3 times’, ‘4–10 times’, and ‘≥ 11 times’. For analysis purposes, this variable was recoded into three categories: ‘never used’, ‘used one time’, and ‘used ≥ two times’ [23].

Participants who indicated that they had never used nitrous oxide answered a subsequent question: “Do you think you will ever use nitrous oxide?”. Answer options were a 5-point Likert scale ‘definitely’, ‘maybe’, ‘probably not’, ‘definitely not’, and ‘I do not know’.

Participants who indicated that they had used nitrous oxide answered another subsequent question: “Do you think you will use nitrous oxide again?” Answer options were ‘definitely’, ‘maybe’, and ‘never again’.

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