Study assessed extent to which peer-influence vulnerability moderates the relationship between campus drinking norms and undergraduates' alcohol use, using the Attention to Social Comparison Information subscale. Students high in attention to social comparison information who believed others were frequent, heavy users of alcohol reported highest levels of drinking. Findings interpreted referencing use of information- and resistance-based alcohol prevention strategies. (Contains 43 references, 2 tables, and 1 figure.) (ADT)