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Since we have found stronger peer influence effects for injunctive norms in Bogot but that pupils were less aware of the descriptive norms, social norms approaches that align descriptive norms with injunctive norms providing accurate prevalence data while emphasizing that most peers disapprove of smoking and vaping may be particularly effective in LMICs (Cialdini, 2003)

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Nine publications (seven unique studies) were identified through systematic screening,54 , 455, 456, 457, 458, 459, 460 and five additional RCTs (four unique studies) were retrieved through supplementary searches,461, 462, 463, 464, 465, 466, 467 resulting in a total of 14 RCTs (11 studies) included in the analysis