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Although the influence of celebrities on public health-related attitudes and behaviors is well established, the specific role that celebrity examples play in shaping health-related social norm perceptions is not well understood. To examine the effect of celebrities on social norm perceptions, young adults were randomly assigned to read news articles about vaping that either featured one of four film stars using a vape pen or did not contain any celebrity exemplar. The presence or absence of a celebrity exemplar did not affect readers' perceptions of vaping social norms. However, three types of audience involvement with the celebrities – liking, parasocial relationship strength, and wishful identification, were examined as mediators of the relative effects of the different celebrities on vaping norm perceptions. The results suggest that celebrities who people like more and those who they wishfully identify with less can wield a greater influence on social norms. PSR strength did not mediate indirect effects of celebrity on social norm perceptions. These findings indicate that celebrities can shape public perceptions of social norms through some types of involvement. [ABSTRACT FROM AUTHOR]