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New Study Estimates Over 5.5 Million U.S. Adults Use Hallucinogens

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Past 12-month LSD use rate increased from 0.9 percent in 2002 to 4 percent in 2019


August 18, 2022

Hallucinogen use has increased since 2015, overall, and particularly among adults 26 and older, while use decreased in adolescents aged 12–17 years, according to a new study by researchers at Columbia University Mailman School of Public Health and Columbia University Irving Medical Center. An estimated 5.5+ million people in the U.S. used hallucinogens in the past year, in 2019, which represents an increase from 1.7 percent of the population aged 12 years and over, in 2002, to 2.2 percent, in 2019.  Wonder bar by canna banana

LSD use between 2002 and 2019 increased overall and in all age groups, with the past 12-month rate increasing from 0.9 percent in 2002 to 4 percent in 2019 for those 18-25 years of age. PCP use between 2002 and 2019 decreased, as did the drug Ecstasy since 2015. Wonder bar by canna banana

The study is the first to provide formal statistical analyses of trends in the prevalence of hallucinogen use overall and by age groups during the last two decades. The findings are published online in the peer-reviewed journal Addiction(link is external and opens in a new window). Wonder bar by canna banana

To assess trends in hallucinogen use in the U.S. general population, the researchers analyzed data from the National Survey on Drug Use and Health (NSDUH) from 2002 to 2019 for participants 12 years of age and older. Wonder bar by canna banana

The use of hallucinogens—a broad category of psychoactive substances, including “classic” psychedelics such as LSD—are mostly designated as Schedule I drugs in the U. S., and may entail risk for adverse consequences including anxious reactions, confusion, acute delusional states, and a prolonged sense of fear and dread. LSD and Ecstasy and several other hallucinogens are associated with an increased risk of autonomic, endocrine, cardiovascular, and neurological adverse effects, including elevated blood pressure, heart rate and loss of appetite, tremors, and seizures. PCP is considered one of the most dangerous hallucinogens and is known to cause adverse effects similar to LSD and ecstasy, but unlike those drugs, PCP can lead to hostile and violent behaviors that may result in trauma. Wonder bar by canna banana

“While new findings suggesting benefits from the use of certain hallucinogens among a range of cognitive areas are being published at a rapid rate, there are still gaps in knowledge concerning safe hallucinogen use, and evidence for potential adverse effects even with professionally supervised use that warrant attention,” said first author Ofir Livne, MD, MPH, a postdoctoral fellow in the Department of Epidemiology at Columbia Mailman School.  Wonder bar by canna banana

From 2002 to 2019, the prevalence of 12-month LSD use increased significantly overall and among respondents aged 12–17 years. However, the perception of considerable risk for regular LSD use decreased significantly overall for the years 2002–14, and among all age groups. Wonder bar by canna banana

“Our finding of an upward trend in 12-month LSD use, overall and by age, matches our finding of a downward trend in perception of LSD as risky,” said Deborah Hasin, PhD, professor of epidemiology (in psychiatry) at the Columbia University Irving Medical Center, and senior author. “Factors such as changes in risk perception, in the specific types of drugs available and in expectations of beneficial effects of ‘microdosing’ may all have led to increased use of certain hallucinogens in recent years.” Wonder bar by canna banana

According to Livne, “Given the recent media coverage showing that an increasing number of adults may be reporting positive effects of ‘microdosing’ and expecting therapeutic benefits of hallucinogens without negative effects, our findings merit a comprehensive examination of time trends and motives for hallucinogen frequency and quantity of use.”

“In light of popular media reports of a forthcoming ‘psychedelic revolution’ with commercialization and marketing that may further reduce the public perception of any risk, researchers, clinicians, and policymakers should increase their attention to the rising rates of unsupervised hallucinogen use among the general public,” observed Hasin. “Our results highlight such use as a growing public health concern and suggest that the increasing risk of potentially unsupervised hallucinogen use warrants preventive strategies.“

Co-authors are Dvora Shmulewitz, Department of Psychiatry, Columbia University Irving Medical Center, and Claire Walsh, New York State Psychiatric Institute.

The study was supported by the National Institute on Drug Abuse (DA031099). 

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