PLoS One
June 30, 2026
David Sjöström, Olea Schau Rybäck, Emma Claesdotter-Knutsson et al.
Background: Anorexia nervosa (AN) is a severe psychiatric disorder with high morbidity, mortality, and relapse rates, most commonly emerging during adolescence. Despite specialized psychological and nutritional treatments, outcomes remain suboptimal, with high rates of relapse and chronicity. Psilocybin has been investigated with preliminary efficacy in other psychiatric conditions...
Child and Adolescent Psychiatry and Mental Health
February 24, 2026
David Sjöström, Emma Claesdotter-Knutsson, Petri Kajonius
BACKGROUND: Adolescents are increasingly using classical psychedelics, yet little is known about how psychedelics use is related to their mental health. Emerging evidence suggests that adolescents may be more vulnerable to adverse outcomes in relation to psychedelic use compared to adults. This descriptive and exploratory study examined differences between adolescents and adults in reported...
Journal of Psychedelic Studies
November 24, 2025
Petri Kajonius, David Sjöström, Emma Claesdotter-Knutsson
3 citations
Abstract A surge in societal and scientific discussion surrounds psychedelic research. One surprising fact keeps standing out: Many users report the psychedelic experience as a positive and lasting impact on their quality of life. The present study aimed to explore the quality and consequences of the most impacting psychedelic experience, with the user's Big Five personality in focus. This...
International Journal of Mental Health and Addiction
April 29, 2025
David Sjöström, Emma Claesdotter-Knutsson, Isabella Gripe et al.
It is still unknown how current trends in psychedelic use among adolescents are related to mental health. This study reports on the prevalence of psychedelic use in a Swedish representative nationwide drug survey and its association with mental health outcomes and user personality. A cross-sectional study using data from the latest 2024 Swedish Council for Information on Alcohol and Other Drugs...
Journal of Psychoactive Drugs
January 2, 2025
Petri Kajonius, David Sjöström, Emma Claesdotter-Knutsson
5 citations
In the midst of growing research and societal discourse on psychedelic substances, a consistent finding is reported: A majority of users report profound personal meaning from their experiences. This pioneering study in Sweden, a nation renowned for its strict drug policies, sought to quantify the extent of reported meaningfulness among Swedish psychedelic users. Results revealed that a majority...
Scientific Reports
May 3, 2024
David Sjöström, Emma Claesdotter-Knutsson, Petri Kajonius
16 citations
Interest in psychedelics is increasing due to the potential for improved mental health and quality of life. However, adverse effects on mental health are still a concern. Personality traits have been suggested to both influence the psychedelic experience and mental health, and even be changed by psychedelic use. The present study describes for the first time a national sample of Swedish...
Research Square
December 13, 2023
David Sjöström, Emma Claesdotter-Knutsson, Petri Kajonius
preprint
Abstract Interest in psychedelics is increasing due to potential for improved mental health and quality of life. However, adverse effects on mental health are still a concern. Personality traits have been suggested to both influence the psychedelic experience and mental health, and even be changed by psychedelic use. The present study describes for the first time a national sample of Swedish...