Early predictors of age at first use of alcohol, marijuana, and cigarettes.

This paper is a report of the relationships between various measures of social adaptation to the first grade classroom and the age at which alcohol, cigarettes, and marijuana were first used by teenagers who began elementary school in a poor black urban community on the South Side of Chicago. Prospective longitudinal community epidemiological data were collected periodically in first and third grades from consecutive total cohorts of children in the 1960s. The 1966-67 population (cohort 3) was followed up at age 16 or 17. This population of 705 children is reported on here regarding early predictors of their first use of these substances. There are three main findings: (1) boys tended to use all substances at an earlier age than girls; (2) students who performed better on first grade IQ and Readiness tests tended to initiate substance use at an earlier age; (3) girls (but not boys) who were rated by their first grade teachers as shy or having learning problems tended to initiate use at a later age. The relationships of these findings to our past investigations of paths leading to substance use are discussed.