Number of participants E-cigarette Initiation

E-cigarette use is defined as answering "yes" to the question: "Have you ever used an e-cigarette, even once or twice?" Participants will be classified as having initiated e-cigarette use if they report any past use at any of these time points.

3, 6, and 12 months

E-Cigarette Knowledge

Measures changes in students' knowledge of e-cigarettes, including nicotine addiction, marketing tactics, laws, and regulations. Items are summed to create a total knowledge score ranging from 0 to 15, with higher scores indicating greater knowledge

Baseline, 3, 6, and 12 months post-intervention

E-Cigarette Harm Perceptions

All harm perception items use a 5-point scale coded from 1 (not at all harmful) to 5 (extremely harmful). The addiction likelihood items use a parallel 5-point scale coded from 1 (not at all likely) to 5 (extremely likely). Items may be examined individually or combined into composite scores with separate subscales for harm perceptions (Items 1, 2, 3, and 5) and addiction likelihood (Items 4 and 6). Higher scores indicate stronger perceptions of harm or addiction risk.

Baseline, 3, 6, and 12 months post-intervention

E-Cigarette Social Perceptions

The first two items use a 4-point Likert scale coded from 1 (strongly/completely disagree) to 4 (strongly/completely agree). The perceived peer acceptability item is coded from 1 (not acceptable) to 4 (completely acceptable). The peer influence item is coded from 1 (friends would tell you not to take a hit) to 4 (friends would exclude you for not taking a hit), with higher scores indicating stronger perceived social pressure to vape. The social media exposure item is coded from 1 (content posted by Public Health Campaigns) to 5 (content posted by e-cigarette brands or sellers), with higher scores reflecting greater exposure to promotional sources rather than educational sources and close peers. Items may be analyzed individually or summed to create a composite index of social norms and perceived social influences related to e-cigarette use, with higher scores indicating more permissive or pro-vaping social perceptions.

Baseline, 3, 6, and 12 months post-intervention

Healthy Attitudes Toward E-Cigarette Use

Participants will complete a pre-survey through a secured, data collection website (Qualtrics Data Collection Software) and then play the videogame intervention. The survey includes 4 questions adapted from the National Youth Tobacco Survey (2014) focus on attitudes about e-cigarettes. Questions have 4 response choices ranging from 1 (strongly disagree) to 4 (strongly agree) or 1 (definitely yes) to 4 (definitely not), or 1 (very unlikely) to 4 (very likely). Some items were reverse coded so that scores of 1 always represented less healthy attitudes and scores of 4 corresponded to more healthy attitudes. Items were averaged into a composite scale that ranged from 1 to 4, with higher scores indicating healthier attitudes.

Baseline, 3, 6, and 12 months post-intervention

Self-Efficacy for E-Cigarette Refusal

Assesses students' confidence in resisting peer pressure to use e-cigarettes. Responses are scored on a 4-point scale ranging from 1 (Not at all sure) to 4 (Very sure). Each item reflects a distinct situation in which students may encounter opportunities or pressure to vape. Scores are summed across the eight items to create a total refusal self-efficacy score, with higher scores indicating greater confidence in the ability to refuse an e-cigarette across a range of social and emotional contexts.

Baseline, 3, 6, and 12 months post-intervention

Difficulties in Emotion Regulation Scale - Short Form (DERS-16)

Measures students' confidence in implementing mental health promotion skills, including accessing support services. Total scores range from 16 to 80. Higher scores indicate greater difficulties with emotion regulation across domains such as nonacceptance, goal-directed behavior, impulse control, awareness, clarity, and access to regulation strategies

Baseline, 3, 6, and 12 months post-intervention

Coping Skills- Brief COPE Inventory

Evaluates the extent to which students apply adaptive coping strategies and emotion regulation skills in response to stress and social pressures. The reduced item set includes one item from each of the following Brief COPE subscales: self-distraction, active coping, denial, substance use, positive reframing, emotional support, religion, acceptance, venting, planning, and humor. Subscale scores range from 1 to 4, with higher scores indicating more frequent use of that coping strategy.

Baseline, 3, 6, and 12 months post-intervention

Intention to Use E-Cigarettes- Pierce Susceptibility Measure

Measures students' susceptibility to future e-cigarette use using a validated measure assessing intention and curiosity about vaping. Total scores range from 3 to 12. Higher scores indicate greater intention or openness to future e-cigarette use.

Baseline, 3, 6, and 12 months post-intervention