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Although beliefs, self-efficacy, and intention to quit have been identified as proximal predictors of initiation or quitting in young adults, few studies have studied how these variables change after a smoking cessation intervention. To evaluate the changes in the beliefs, self-efficacy, and intention to avoid smoking and determine if these are potential mediators in quitting, following a smoking cessation intervention, aimed at tobacco-dependent college students. Single-blind, pragmatic randomized controlled trial with a 6-month follow-up. A total of 255 smoker students were recruited from September 2013 to February 2014. Participants were randomly assigned to intervention group (n = 133) or to control group (n = 122). The students in the intervention group received a multicomponent intervention based on the Theory of Triadic Influence (TTI). The strategies of this program consisted of a 50 min motivational …