Monitoring the Future (MTF) is a long-term study of substance use and related factors among U.S. adolescents, college students, and adult high school graduates through age 55. It is conducted annually and supported by the National Institute on Drug Abuse. MTF findings identify emerging susbstance use problems, track substance use trends, and inform national policy and intervention strategies. MTF is designed to detect age, period, and cohort effects in substance use and related attitudes. Age effects are similar changes at similar ages seen across multiple class cohorts; they are common during adolescence. Period effects are changes that are parallel over a number of years across multiple age groups (in this case, all three grades under study--8, 10, and 12). Cohort effects are similar changes among those of a similar age or grade in school, that are then maintained as the cohorts age. The key findings for 8th, 10th, and 12th graders surveyed across the coterminous U.S. in 2017 are summarized in this report. [For the report from the previous year "Monitoring the Future National Survey Results on Drug Use, 1975-2016: Overview, Key Findings on Adolescent Drug Use," see ED578534. For "Demographic Subgroup Trends among Adolescents in the Use of Various Licit and Illicit Drugs, 1975-2017. Monitoring the Future Occasional Paper Series. Paper 90," see ED589759. For "Monitoring the Future National Survey Results on Drug Use, 1975-2017. Volume I, Secondary School Students," see ED589763. For "Monitoring the Future National Survey Results on Drug Use, 1975-2017. Volume II, College Students & Adults Ages 19-55," see ED589764.]