Subjects also answered a separate series of questions about substance use among students in their high school who were in the same grade, or if the offspring were high school graduates, about their peers during the 12th grade. For the school peer questions, offspring were asked how many students used any drugs including marijuana, how many used alcohol and how many smoked cigarettes by answers to the following questions: How many students in your high school who are/were in the same grade as you … 1) used any drugs including marijuana?, `…used alcohol?, `…smoked cigarettes'.
