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(a) Survival plots for high (75th percentile) and low (25th percentile) levels of generalized anxiety, depicting age at first use of alcohol; (b) Survival plots for high (75th percentile) and low (25th percentile) levels of generalized anxiety, depicting age at first use of tobacco; (c). Survival plots for high (75th percentile) and low (25th percentile) levels of generalized anxiety, depicting age at first use of marijuana
