Approximately two thirds of the way through the video, a
commercial break began with a computer commercial. To this
point, all participants had seen the same video. After the commercial,
one of eight anti-inhalant messages formed by the factorial
combination of source, target, and harms was presented. The
messages were designed as advertisements and were assigned
randomly across all participants. After the 1-min ads were
screened, the antibullying video continued for approximately 1.5
min, followed by the posttest, which was delivered on screen.
Afterwards, participants were debriefed as to the purpose of the
study. The study took approximately 40 min from assent to debriefing.