In this study, we examined the content of adolescents' conversations with their friends about substance use, adolescents' reactions to such conversations, and reasons why some adolescents did not engage in such conversations. Based on 25 semistructured interviews with high school students, we identified three themes: informational, persuasive, and relational messages. Informational messages included discussing how many peers use substances and clarifying rumors about a friend's substance use. Persuasive messages involved direct anti-substance-use messages (e.g., warning), direct pro-substance-use messages (e.g., legalizing marijuana), indirect anti-substance-use messages (e.g., disliking their substance-use experience), and indirect pro-substance-use messages (e.g., intentions to use substances). Relational messages included joking about substance use and establishing code words for use. Adolescents reacted to their conversations in several ways, such as shock and increased relational closeness. When adolescents did not talk about substance use with their friend, they offered several reasons, including low response efficacy and fear of ruining the friendship.

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