Swipe left or right to scroll. Monitoring the Future Study: Trends in Prevalence of Heroin for 8th Graders, 10th Graders, and 12th Graders; 2020 (in percent)* Drug Time Period 8th Graders 10th Graders 12th Graders Heroin Lifetime 0.5 0.3 0.4 Past Year 0.2 0.2 0.3 Past Month 0.2 0.1 0.3 January 24, 2020
