More teenagers, young adults, middle and working class people, and suburban residents are now using heroin. . . One in 10 eighth-graders smokes marijuana at least once a month. One in 5 for tenth graders and 1 in four for high school seniors. The average age of first use is 13.9 years. More than 75,000 sixth-graders have tried marijuana . . .
Many factors influence testing results.
Not all people are alike, nor are the drugs they take equal. More Photographs . . . For more information on Publishers Group documents and training materials, go here . .