Specifically, the data identified a 38 percent year-over-year reduction in self-reported marijuana use among eight graders, a 38 percent decline among 10th graders, and a 13 percent decrease among 12th graders.
Data provided by the Substance Abuse Mental Health Services Administration’s (SAMHSA) most recent National Survey on Drug Use and Health finds that marijuana use fell significantly year-over-year among those ages 12 to 17.
Investigators reported, “[D]espite significant increases in levels of cannabis use in our sample, change in cannabis use did not predict changes in motivation, which suggests that cannabis use may not lead to reductions in motivation over time.”
“Our results suggest that young adults who lived in an area with a greater density of any type of outlet were not significantly more likely to report stronger intentions to use cannabis, e-cigarettes, or cannabis mixed with tobacco/nicotine in the future.”
“The overall percentage of students who reported using marijuana at least 1 time during the previous 30 days in 2019 was not measurably different from the percentage in 2009…. There was no measurable difference between 2009 and 2019 in the percentage of students who reported that illegal drugs were made available to them on school property.”
“This study found no evidence between 1991 and 2015 of increases in adolescents reporting past 30-day marijuana use or heavy marijuana use associated with state MML [medical marijuana law] enactment or operational MML dispensaries.”
“In examining marijuana use before and after legalization of recreational sales in California, we found that frequency of use did not change significantly overall, including following legalization.”
Year-over-year, “the use of marijuana in all forms … by adolescents [nationwide] did not significantly change in any of the three grades [8th grade, 10th grade, and 12th grade] for lifetime use, past 12-month use, past 30-day use, [or] daily use.”