al Institute on Drug Abuse, National Institutes of Health. The survey has tracked 12th graders' illicit drug use and related attitudes since 1975; in 1991, 8th and 10th graders were added to the study. For the 1999 study, 49,866 students were surveyed from a representative sample of 422 public and private schools nationwide. ** "Lifetime" or "ever used" refers to use at least once during a respondent's lifetime. "Past year" refers to an individual's drug use at least once during the year preceding their response to the survey. "Past month" refers to an individual's drug use at least once during the month preceding their response to the survey. Anabolic steroids are artificial versions of a hormone that's in all of us -- testosterone. (That's right, testosterone is in girls as well as guys.) Testosterone not only brings out male sexual traits, it also causes muscles to grow. Some people take anabolic steroid pills or injections to try to build muscle faster. ("Anabolic" means growing or building.) But these steroids also have other effects. They can cause changes in the brain and body that increase risks for illness and they may affect moods...
