Marijuana use by teenagers has declined since the COVID-19 pandemic.  In contrast, adult use of cannabis products, including alcohol, has either remained the same or increased.  When comparing the data for drug and tobacco use in 2020 compared to 2018 and 2019, the data indicates that:  Cannabis use among teenagers ages 13 and 15 dropped by 3.4%.  Tobacco use declined by about 4 points, and use of other illegal drugs dropped 2.5%.  Cannabis use in teens ages 16 and 17 dropped 7.3%.  Tobacco use dropped by 10%. Meanwhile, the use of other drugs declined by 3%.   One reason for the decline is teenagers having less access to their social circles and being 'stuck inside' with less access to drugs.