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(a) Survival plots for high (75th percentile) and low (25th percentile) levels of social anxiety, depicting time from first use to first alcohol-related problem; (b) Survival plots for high (75th percentile) and low (25th percentile) levels of social anxiety, depicting age time from first use to first tobacco-related problem; (c) Survival plots for high (75th percentile) and low (25th percentile) levels of social anxiety, depicting time from first use to first marijuana-related problem
