Since the advent of adult-use legalization, more adults are consuming cannabis while teen use has declined.

That’s the top-line takeaway from the latest SAMHSA survey, an important annual study by the federal government that looks at the use of alcohol, tobacco, cannabis, and other drugs among Americans 12 years and older. The Substance Abuse and Mental Health Services Administration (SAMHSA), an agency of the Department of Health and Human Services, released this year’s report yesterday.

Health and Human Services Secretary Alex Azar said this year’s National Survey on Drug Use and Health “contains very encouraging news.” The number of Americans misusing pain relievers dropped substantially, he noted, “and fewer young adults are abusing heroin and other substances.”

Heroin use among young people, age 12 to 25, was down slightly from 2017. Tobacco cigarette use among all Americans continued to plunge, down from 26% in 2002 to 17.1% in 2018. Tobacco use among young adults dropped from 41% in 2002 to 19% in 2018. Binge drinking also decreased, from 39% (in the past month) in 2015, to 35% in 2018.

(Courtesy of SAMHSA – Substance Abuse and Mental Health Services Administration)

Adult Cannabis Use Up, Teen Use Down

According to the SAMHSA data, 13.3% of adults age 26 and older consumed cannabis at least once in the previous year. That’s an increase of nearly 3% from 2015, and comes close to doubling the 2002 rate, which was 7%.

The same survey found that cannabis use among teens has remained relatively flat over the past few years, while continuing a long-term trend of decline. In the 2018 survey, 12.5% of respondents age 12 to 17 used cannabis at least once in the previous year. That’s up 0.1% from 2017. Teen use has hovered between 12% and 13% since 2014. Overall, teen use has declined over the past 16 years, from nearly 16% in 2002 to 12.5% last year.

Relied on Since 2002

The SAMHSA study has become an institution in mental health and drug policy circles since its inception in 2002. It’s often relied on for baseline data on mental health and substance abuse. And it can reveal alarming trends. Diagnoses of mental health issues among young adults age 18 to 25, for instance, have increased 35% in the past five years. That could be an indication that young adults are experiencing greater distress, or are more apt to seek help from a medical professional, or both.

This year’s data came from face-to-face interviews conducted with more than 67,000 Americans. But the study also comes with limitations—and those have become glaring in the past few years, as the United States has suffered through a deadly opioid addiction and overdose death crisis.

Late To Track Opioids

The SAMHSA study only started tracking prescription opioid misuse in 2015. The agency’s data claims a marked decline in misuse among young adults (age 18 to 25) from 2015 to 2018, and an overall 21% decline in misuse among all respondents 12 years and older. That’s good news, if true. Yet during that same time period, national drug overdose deaths due to opioids increased 44%. (And that’s just 2015 to 2017.)

Similarly, SAMSHA data show a fairly stable trend regarding heroin use over the past 10 years. At the same time, data from the Centers for Disease Control show that heroin-related overdose deaths increased by more than five times from 2010 to 2017.

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