Drug Abuse Resistance Education. One in 10 eighth-graders smokes marijuana at least once a month. One in 5 for 10th graders and 1 in 4 for high-school seniors. The average age of first use is 13.9 years. More than 75,000 sixth-graders have tried marijuana. . .
Teenage girls are as likely as boys to smoke, drink and use illegal drugs . . .