Changes in Cannabis Consumption During the Global COVID-19 Lockdown: The International COVISTRESS Study

Juliette Salles*, Antoine Yrondi, Fouad Marhar, Nicolas Andant, Raimundo Avilés Dorlhiac, Binh Quach, Jiao Jiao, Samuel Antunes, Ukadike Chris Ugbolue, Julien Guegan, Karine Rouffiac, Bruno Pereira, The COVISTRESS Network, Maélys Clinchamps, Frederic Dutheil, Stéphanie Mestres, Cécile Miele, Valentin Navel, Lénise Parreira, Yves BoirieJean Baptiste Bouillon-Minois, Martine Duclos, Maria Livia Fantini, Jeannot Schmidt, Stéphanie Tubert-Jeannin, Mickael Berthon, Pierre Chausse, Michael Dambrun, Sylvie Droit-Volet, Serge Guimond, Laurie Mondillon, Armelle Nugier, Pascal Huguet, Samuel Dewavrin, Geraldine Naughton, Amanda Benson, Claus Lamm, Karen Gbaglo, Vicky Drapeau, Benjamin Bustos, Yaodong Gu, Haifeng Zhang, Peter Dieckmann, Julien Baker, Yanping Duan, Gemma Gao, Wendy Y.J. Huang, Ka Lai Kelly Lau, Chun Qing Zhang, Perluigi Cocco, Rosamaria Lecca, Monica Puligheddu, Michela Figorilli, Morteza Charkhabi, Reza Bagheri, Daniela Pfabigan, Peter Dieckmann, David Neto, Pedro Almeida, Maria João Gouveia, Pedro Quinteiro, Constanta Urzeala, Benoït Dubuis, Juliette Lemaignen, Andy Liu, Foued Saadaoui, Keri Kulik, Kuan chou Chen

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

7 Citations (Scopus)


Introduction: COVID-19 lockdown measures have been sources of both potential stress and possible psychological and addiction complications. A lack of activity and isolation during lockdown are among the factors thought to be behind the growth in the use of psychoactive substances and worsening addictive behaviors. Previous studies on the pandemic have attested to an increase in alcohol consumption during lockdowns. Likewise, data suggest there has also been a rise in the use of cannabis, although it is unclear how this is affected by external factors. Our study used quantitative data collected from an international population to evaluate changes in cannabis consumption during the lockdown period between March and October, 2020. We also compared users and non-users of the drug in relation to: (1) socio-demographic differences, (2) emotional experiences, and (3) the information available and the degree of approval of lockdown measures. Methods: An online self-report questionnaire concerning the lockdown was widely disseminated around the globe. Data was collected on sociodemographics and how the rules imposed had influenced the use of cannabis and concerns about health, the economic impact of the measures and the approach taken by government(s). Results: One hundred eighty two respondents consumed cannabis before the lockdown vs. 199 thereafter. The mean cannabis consumption fell from 13 joints per week pre-lockdown to 9.75 after it (p < 0.001). Forty-nine respondents stopped using cannabis at all and 66 admitted to starting to do so. The cannabis users were: less satisfied with government measures; less worried about their health; more concerned about the impact of COVID-19 on the economy and their career; and more frightened of becoming infected in public areas. The risk factors for cannabis use were: age (OR = 0.96); concern for physical health (OR = 0.98); tobacco (OR = 1.1) and alcohol consumption during lockdown (OR = 1.1); the pre-lockdown anger level (OR = 1.01); and feelings of boredom during the restrictions (OR = 1.1). Conclusion: In a specific sub-population, the COVID-19 lockdown brought about either an end to the consumption of cannabis or new use of the drug. The main risk factors for cannabis use were: a lower age, co-addictions and high levels of emotions.

Original languageEnglish
Article number689634
Number of pages9
JournalFrontiers in Psychiatry
Publication statusPublished - 11 Nov 2021

Scopus Subject Areas

  • Psychiatry and Mental health

User-Defined Keywords

  • addiction
  • cannabis (marijuana)
  • COVID-19
  • lockdown
  • tobacco


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