Marijuana use continues to rise among U.S. college students; use of narcotic drugs declines

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Sept. 6, 2016 Contact: Jared Wadley, (734) 936 7819, jwadley@umich.edu Janice Lee, (734) 647 1083, janiice@umich.edu EMBARGOED FOR RELEASE UNTIL 12:01 A.M. ET THURSDAY, SEPT. 8, 2016 Note: Tables and figures associated with this release are available at: http://www.monitoringthefuture.org/collegetablesandfigures2015 Marijuana use continues to rise among U.S. college students; use of narcotic drugs declines ANN ARBOR The one drug that stands out as still increasing among college students is marijuana. According to the most recent national Monitoring the Future study, college student marijuana use continues its decade long increase. In 2015, 38 percent of college students indicated that they had used marijuana in the prior 12 months, up from 30 percent in 2006. Daily or near daily use of marijuana defined as having used 20 or more times in the prior 30 days has also increased in recent years for college students, rising from 3.5 percent in 2007 to 5.9 percent in 2014, the highest level of daily use measured in the last 34 years. (Findings on college students were first available in the study in 1980.) However, in 2015 their daily use fell back some to 4.6 percent or one in every 22 college students. A decline in the degree of risk of harm associated with using marijuana may account for much of the increase in use. Since 2003 proportions of 19 to 22 year olds seeing regular use of marijuana as dangerous to the user has declined sharply from 58 percent in 2003 to 33 percent by 2015. John Schulenberg, one of the study s lead researchers, comments, This increase in use and decrease in perceived risk of harm regarding marijuana use should be taken seriously by college administrators, parents, and students themselves. We know through other research that frequent marijuana use can adversely affect academic performance and college completion. In contrast to the story for marijuana use, other types of drug use are declining among college students. Non medical use of one very important class of drugs, prescription narcotic drugs, has been declining among college students since reaching a high in 2006 of 8.8 percent annual prevalence (that is, any use in the prior 12 months). By 2015, 3.3 percent of college students reported using any narcotic drug in the past 12 months without medical supervision a drop of about six tenths.

It appears that college students, at least, are hearing and heeding the warnings about the very considerable dangers of using narcotic drugs, said Lloyd Johnston, the study s principal investigator. Use of heroin, another narcotic drug, has been low among college students for many years. The highest annual prevalence recorded since 1980 was in 1998 at 0.6 percent, but the rate has been at or under 0.3 percent since 2005 and was down to 0.1 percent in 2015. These findings emanate from the long term Monitoring the Future study, which has been tracking substance use of all kinds among American college students for the past 36 years. It is conducted by a team of researchers at the University of Michigan and is funded by the National Institute on Drug Abuse. These results are based on full time students who are one to four years beyond high school graduation and enrolled in a two year or four year college in March of the year in question. Use of amphetamines has started to decline among college students. From 2008 through 2012 the percent of college students who reported using an amphetamine without medical supervision in the prior 12 months rose from 5.7 percent to 11.1 percent, likely due to more students using them to improve their academic performance. But, by the time of the latest survey in 2015, that had fallen slightly to 9.7 percent. It appears that the increase in non medical use of prescription stimulant drugs may have passed its peak, Johnston said, though about one in ten college students still report using them in the prior 12 months. The use of MDMA (ecstasy and more recently Molly ) had made a bit of a comeback among college students between 2007 and 2012, but has been in decline since then. Annual prevalence in 2015 was 4.2 percent. Certain drugs have declined in popularity quite rapidly among the nation s college students. For example, past year use of synthetic marijuana, which is usually sold over the counter under such brand names as K 2 and Spice, dropped from 8.5 percent when first measured in 2011 to just 1.5 percent in 2015 a decline of about 80 percent. Salvia has fallen from 5.8 percent when its use was first measured in 2009 to just 0.4 percent in 2015 a decline of more than 90 percent. Some other drugs never gained much of foothold on American college campuses. Past year use of so called bath salts, a form of synthetic stimulants usually sold over the counter, has never exceeded 0.3 percent among college students since first being measured in 2012, and stands at 0.1 percent in 2015. Past year use of inhalants has been below 2 percent since 2005. The so called club drugs, Rohypnol and GHB, never really caught on, and have had negligible

rates of use among college students. Annual non prescribed use of tranquilizers (4.3 percent) and sedatives (2.3 percent) has changed little in recent years, though these annual prevalence rates in 2015 are below those observed in the college population in the early 2000s. In general, college males are more likely than college females to use nearly all of the illicit drugs. Sedatives are the primary exception; and there the genders are very close in their annual prevalence rates. Cigarettes and Alcohol Cigarette smoking continues to decline gradually among college students, but the cumulative decline over the past 16 years has been dramatic. A peak rate of any smoking in the prior 30 days was reached in 1999 at 31 percent. By 2015 the rate had fallen by nearly two thirds to 11 percent, a record low. Daily smoking declined even more, from 19.3 percent in 1999 to 4.2 percent in 2015 a drop of nearly four fifths and also a record low since 1980. The study shows that large declines in smoking rates have been occurring among secondary school students, as well, notes Johnston, so much of the improvement among college students actually began when they were still in high school. Their high school classmates not in college have dramatically higher rates of smoking: in 2015, 23 percent of them indicated past month smoking vs. 11 percent among the college students. Heavy smoking is even more concentrated among those not in college, with their half pack or more per day smoking rate at 9.1 percent vs. 1.4 percent among college students. Cigarette smoking has become increasingly concentrated among the less educated, Johnston said. Through 1993 college females had higher rates of smoking than college males; but since 1994 the opposite has been true. Electronic vaporizers, which include e cigarettes, were used in the month prior to the survey by 14 percent of college males and 6 percent of college females. Alcohol clearly remains the drug of choice among college students, with 79 percent indicating that they used in the past 12 months and 63 percent in the past 30 days. Indeed, 62 percent say that they were drunk at least once in the past 12 months and 38 percent in the past 30 days. So drinking and drunkenness remain quite commonplace on the nation s college campuses, even though there has been some modest falloff in these rates since the early 1980s.

Binge drinking defined as having five or more drinks on at least one occasion in the past two weeks was reported by 40 percent of all college students in 2015 (close to the 38 percent who reported being drunk in the last month). While the rate of binge drinking has gradually declined among college males over the past thirty years, there has been very little change in the rate among college females, resulting in some closing of the gap between the genders (though males have consistently had a higher rate of binge drinking). Of even greater concern than binge drinking is what we have called extreme binge drinking, defined as having 10 or more drinks or even 15 or more drinks on at least one occasion in the prior two weeks, Johnston said. Over the years 2011 to 2015 combined, about one in nine college students (11.2 percent) reported having 10 or more drinks in a row on at least one occasion in the prior two weeks, while one in 25 (4.0 percent) reported having 15 or more drinks in a row at least once in the same interval. Drinking at these levels can result in alcohol poisoning, serious accidents, and a host of unwise and dangerous behaviors, observes Johnston. So this remains a serious problem to be addressed. * * * The Monitoring the Future study (MTF) is now in its 42 nd year. Starting in 1980, the study has included nationally representative samples of full time college students who are one to four years beyond high school. The annual samples of college students have ranged between 1,000 and 1,500 per year. MTF is an investigator initiated research undertaking, conceived and conducted by a team of research professors (listed as authors below) at the University of Michigan s Institute for Social Research. It is funded under a series of peer reviewed, competitive research grants from the National Institute on Drug Abuse, one of the National Institutes of Health. MTF also conducts an annual national survey of high school seniors, from which a random, nationally representative subsample is drawn for follow up by mail in future years. Of these follow up respondents, those who are one to four years beyond high school and who report being in a 2 year or 4 year college full time in March comprise the college student sample each year. They are not drawn from particular colleges or universities, which helps to make the sample more representative of the wide range of two and four year institutions of higher education in the country.

The findings presented here are drawn from Chapters 8 and 9 in this newly published monograph: Johnston, L.D., O Malley, P.M, Bachman, J.G., Schulenberg, J.E. & Miech, R. A. (2016). Monitoring the Future national survey results on drug use, 1975 2015: Volume 2, College students and adults ages 19 55. Ann Arbor: Institute for Social Research, The University of Michigan, 427 pp. Available at http://monitoringthefuture.org/pubs/monographs/mtf vol2_2015.pdf