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Cannabis and COVID-19: Reasons for Concern. 

van Laar MW, Oomen PE, van Miltenburg CJA, Vercoulen E, Freeman TP, Hall WD. 

Front Psychiatry. 2020 Dec 21;11:601653. doi: 10.3389/fpsyt.2020.601653. PMID: 33408655; PMCID: PMC7779403.


Cannabinoids and the endocannabinoid system in reward processing and addiction: from mechanisms to interventions

Spanagel R. 

Dialogues Clin Neurosci. 2020 Sep;22(3):241-250. doi: 10.31887/DCNS.2020.22.3/rspanagel. PMID: 33162767; PMCID: PMC7605022.



Informationsseite des Deutschen Hanfverbandes (DHV), November 2020


A large-scale genome-wide association study meta-analysis of cannabis use disorder

Johnson, Emma CWalters, Raymond et al.

The Lancet Psychiatry, Volume 0, Issue 0 


Changes in delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD) concentrations in cannabis over time: systematic review and meta-analysis. 

Freeman, T. P., Craft, S., Wilson, J., Stylianou, S., ElSohly, M., Di Forti, M., and Lynskey, M. T. (2020) 

Addiction, doi.org/10.1111/add.15253


Cannabis use prompts need for more anesthesia during surgery, increases pain 

CHICAGO - Not only might cannabis users require more anesthesia during surgery than non-users, they may have increased pain afterwards and use higher doses of opioids while in the hospital, suggests first-of-its kind research being presented at the ANESTHESIOLOGY® 2020 annual meeting. (American Society of Anesthesiologists, 05.10.2020)


Marijuana Legalization and Youth Marijuana, Alcohol, and Cigarette Use and Norms

Jennifer A. Bailey et al, 

American Journal of Preventive Medicine (2020).

Marijuana Legalization and Youth Marijuana, Alcohol, and Cigarette Use and Norms

Neuseeland. Legalising cannabis in Aotearoa New Zealand: What does the evidence say?

Office of the Prime Minister’s Chief Science Advisor, Neuseeland, 2020


Prescription Opioid Distribution after the Legalization of Recreational Marijuana in Colorado.

Kropp Lopez AK, Nichols SD, Chung DY, Kaufman DE, McCall KL, Piper BJ. 

Int J Environ Res Public Health. 2020;17(9).


Prescription Opioid Distribution after the Legalization of Recreational Marijuana in Colorado.

Kropp Lopez AK, Nichols SD, Chung DY, Kaufman DE, McCall KL, Piper BJ. 

Int J Environ Res Public Health. 2020;17(9).


Potential Adverse Drug Events with Tetrahydrocannabinol (THC) Due to Drug–Drug Interactions.

Brown, J.D. 

J. Clin. Med. 2020, 9, 919.


Cannabis use, subsequent other illicit drug use and drug use disorders: A 16-year follow-up study among Swedish adults.

Rabiee R, Lundin A, Agardh E, Forsell Y, Allebeck P, Danielsson AK.

Addict Behav. 2020 Jul;106:106390. doi: 10.1016/j.addbeh.2020.106390. 


Δ9-tetrahydrocannabinol: harmful even in low doses?

Hjorthøj, Carsten et al.

The Lancet Psychiatry, Volume 7, Issue 4, 296 - 297 


Smoking heroin with cannabis versus injecting heroin: unexpected impact on treatment outcomes.

Morgan, N., Daniels, W. & Subramaney, U. 

Harm Reduct J 16, 65 (2019) doi:10.1186/s12954-019-0337-z


A novel phytocannabinoid isolated from Cannabis sativa L. with an in vivo cannabimimetic activity higher than Δ9-tetrahydrocannabinol: Δ9-Tetrahydrocannabiphorol.

Citti, C., Linciano, P., Russo, F. et al. 

Sci Rep 9, 20335 (2019). doi.org/10.1038/s41598-019-56785-1


Cannabiskonsum: Rekreative oder medizinische Beweggründe? Befragung von Betroffenen

Andreas Wenger, Michael Schaub, Schweizer Institut für Sucht- und Gesundheitsforschung

Nr. 399/2019


Kanada. Health Reports: What has changed since cannabis was legalized?

Statistics Canada, 21.02.2020, doi.org/10.25318/82-003-x202000200002-eng


Cannabis increases susceptibility to false memory.

Kloft L, Otgaar H, Blokland A, Monds LA, Toennes SW, Loftus EF, Ramaekers JG.

Proc Natl Acad Sci U S A. 2020 Feb 10. pii: 201920162. doi: 10.1073/pnas.1920162117.


Potentes Haschisch aus Marokko: Haschisch und Marihuana im Vergleich

In Deutschland enthält seit 2016 Haschisch im Schnitt mehr THC als Marihuana. (taz-blog, 17.12.2019)


Cannabis use during methadone maintenance treatment for opioid use disorder: a systematic review and meta-analysis 

Heather McBrien, Candice Luo, Nitika Sanger, Laura Zielinski, Meha Bhatt, Xi Ming Zhu, David C. Marsh, Lehana Thabane, and Zainab Samaan

cmajo 7:E665-E673; published online November 19, 2019, doi:10.9778/cmajo.20190026 


Kanada. Cannabis Legalization: Year One Observations

Provides the first summary of Canada’s experience in the first year of retail sales after cannabis legalization, with a focus on the public health and safety objectives of the Cannabis Act. Canada’s relationship with legal cannabis is evolving and the market is still developing. With the Act in effect for less than a year, any discussion of impact is limited to preliminary observations. (Canadian Centre on Substance Use and Addiction, 2019)


Grading cannabis strength ‘will improve mental health of users’ 

Addiction experts say standard units, similar to those used for alcohol, would help consumers know the level of drug they are taking and its effects. (The Guardian, UK, 13.10.2019)


'Standard THC Units': a proposal to standardise dose across all cannabis products and methods of administration.

Freeman TP, Lorenzetti V.

Addiction. 2019 Oct 12. doi: 10.1111/add.14842. 



Schweiz. Synthesebericht «Cannabis» der Eidgenössischen Kommission für Suchtfragen

Eidgenössische Kommission für Suchtfragen (EKSF), 02.05.2019


Cannabidiol Counteracts the Psychotropic Side-Effects of Δ-9-Tetrahydrocannabinol in the Ventral Hippocampus Through Bi-Directional Control of ERK1-2 Phosphorylation

Roger Hudson, Justine Renard, Christopher Norris, Walter J. Rushlow, Steven R. Laviolette

Journal of Neuroscience 30 September 2019, 0708-19; DOI: 10.1523/JNEUROSCI.0708-19.2019 



Kanada. Canadian Cannabis Research Database

The Canadian Cannabis Research Database is an online tool that allows individuals to search current and ongoing cannabis research activities underway in Canada. Research since 2015 is covered under 40 possible topics.

The database is intended for researchers, healthcare providers and individuals involved in public health policy. It enables them to search research projects related to the health and social impacts of cannabis, while also fostering communication and collaboration between researchers and identifying potential gaps in cannabis research. (Canadian Centre on Substance Use and Addiction, Kanada)


Journal of Cannabis Research

Journal of Cannabis Research is an open access, peer-reviewed, international journal which welcomes submissions covering all topics pertaining to cannabis. 

The journal is an official publication of the Institute of Cannabis Research at Colorado State University-Pueblo.


Cannabis - A field in flux. 

Fifty years ago, cannabis was known as the drug most emblematic of counterculture. Today, many people promote it as a fount of treatments for almost any ailment imaginable. This immense about-turn is reflected in changes in legal regimes: medicinal use of cannabis is now permitted in many countries, and some also allow the drug to be used recreationally. The times, they have a-changed. (Nature Outlook, 28.08.2019)


Nabiximols kann Cannabiskonsum vermindern

Sydney – Eine Substitution mit Nabiximols, einer Mischung aus Tetrahydrocannabinol (THC) und Cannabidiol (CBD), hat in einer randomisierten Placebo-kontrollierten Studie in JAMA Internal Medicinedie Psychotherapie der Cannabis-Abhängigkeit unterstützt (2019; doi: 10.1001/jamainternmed.2019.1993). (aerzteblatt.de, 17.09.2019)


EMCDDA. New EMCDDA report highlights greater diversity of cannabis products, increasing potency and the need for close monitoring of health effects 

Cannabis products have become increasingly diverse in Europe and close monitoring of their potency and potential health effects is essential. These are among the conclusions of a new report published today by the EU drugs agency (EMCDDA) ahead of International day against drug abuse and illicit trafficking (26 June) (1). The report — Developments in the European cannabis market (2) — provides an overview of emerging and established cannabis products in Europe. (EMCDDA, Lissabon  25.06.2019 (News release No 5/2019))