The Monitoring The Future (MTF) study began in 1975, initially surveying drug-use habits in a single class of senior high school students. Over the next few years the survey expanded to include younger school students, while annually following up with all prior participants.

As the cohort grew older the survey started offering compelling insights into middle-aged American drug use. In the late 1980s, once the initial cohort hit their 30s, the survey expanded to include a more granular tracking of different drug use behaviors.

The latest MTF survey, collected between April and October in 2021, offers revealing insight into changing drug use trends in the United States. And perhaps the most significant change in recent data has been the incredible increase in hallucinogen use across nearly all age groups.