Journal of Psychoactive Drugs
June 19, 2026
Carla J. Berg, Darcey M. Mccready, Cassidy R Loparco et al.
= 26.38, ~50% past-month cannabis use by design) completed an online survey. Multivariable regression assessed sociodemographics, mental health, and adverse childhood events (ACEs) in relation to: (1) past-year psychedelic use; and (2) among those reporting lifetime use: (a) lifetime microdosing and (b) use motives. Lifetime and past-year psychedelic use were 27.7% and 11.9% (commonly...
Journal of Studies on Alcohol and Drugs
May 28, 2026
Cassidy R Loparco, Matthew E Rossheim, Kayla K Tillett et al.
Retail sales of intoxicants, including derived intoxicating cannabis products (DICPs) such as delta-8 tetrahydrocannabinol (THC) and hallucinogenic mushrooms, have rapidly increased throughout the US, despite their sale being federally illegal. This study assessed DICP and hallucinogenic mushroom availability in US smoke shops with differing DICP and psilocybin laws. In May-October 2025, using...
International Journal of Environmental Research and Public Health
February 17, 2026
Carla J. Berg, Cassidy R Loparco, Darcey M. Mccready et al.
1 citation
This study assessed the correlates of cannabis and psychedelic use and legalization support among young adults in the United States (US). Using 2025 data among adults ages 18–34 (n = 3227), we assessed cannabis and psychedelic message exposure and perceptions, mental health symptoms (Patient Health Questionnaire-4 [PHQ-4]), and adverse childhood experiences (ACEs) in relation to past-6-month...
Substance Use & Misuse
2025
Sofia E Olsson, Vishaldeep K Sekhon, Cassidy R Loparco et al.
Following the United States (U.S.) Federal Agriculture Improvement Act of 2018, many retailers began selling intoxicating cannabis products, including Delta-8 tetrahydrocannabinol (THC) as "hemp," claiming that it provided a legal loophole to do so. This qualitative study assessed Delta-8 THC messaging on YouTube, the world's second-most visited website. In 2022, two researchers searched the...
Addiction (Abingdon, England)
June 1, 2023
Cassidy R Loparco, Matthew E Rossheim, Scott T Walters et al.
Delta-8 tetrahydrocannabinol (THC) is a psychoactive substance from the Cannabis plant that has been rising in popularity in the United States since the 2018 US Farm Bill implicitly legalized it. This study reviewed research from peer-reviewed and non-peer-reviewed (e.g. anecdotal and news) reports related to delta-8 THC to summarize current knowledge and implications for public health and...
Journal of Studies on Alcohol and Drugs
May 1, 2023
Matthew E Rossheim, Cassidy R Loparco, Doug Henry et al.
41 citations
The 2018 U.S. Federal Agriculture Improvement Act ("Farm Bill") resulted in what some have called a "legal loophole" in cannabis regulation. As different types of cannabis products proliferate, so has the terminology used to attempt to categorize them. This article presents a variety of potential descriptors to encourage dialogue about the language used to classify the multitude of psychoactive...