The drug use patterns of Indiana youth from the seventh to the twelfth grades in 1977 and 1980 were assessed. Findings reveal that: (1) There is an increase in the availability of marijuana at all grade levels; (2) The percentage of students who have tried most of the illegal drugs has increased, with the larger increase among the older students; (3) Students who use some of the illegal drugs appear to have started using them at an earlier age than did their 1977 counterparts; (4) Current younger students are starting their drug use at earlier ages than did the current older students; (5) The majority of students who have the chance to try drugs refuse to do so; (6) Fewer teenagers smoke cigarettes today than did in 1977; (7) The percentage of students who use alcohol has not changed significantly over the past three years; and (8) There is an increase in the amount of alcohol consumed at social occasions. (JD)