Skip to content Accessibility statement

Female cannabis users underrepresented in health research, study reveals

News

Posted on Tuesday 4 June 2019

Research at the University of York has shown that women are underrepresented in research into the links between cannabis and psychosis, which could limit understanding of the impact of the drug.
Women and areas outside of America, Europe and Australia are underrepresented in cannabis research

In a review of scientific literature over a number of years, Ian Hamilton from the University of York’s Department of Health Sciences, found that the majority of research reflects the experience of male cannabis users, with very limited information on how women react to the drug. 

They also found that there was little research on cannabis psychosis in countries where cannabis use is high. Research tends to be focused in America, Europe and Australia, missing the impact of the drug in Africa, Asian and the Middle East, where very little is known about the number of people that develop cannabis psychosis. 

Opening up access

Ian Hamilton said: “Across the world governments are opening up access to cannabis for health or recreation. This means that it is important that people have access to information about the risks as well as benefits of using cannabis. 

"Cannabis psychosis is one risk which can have a devastating effect on an individual and their family. Building on previous research from the University of York, we reviewed the evidence linking cannabis to psychosis, and identified two significant problems. 

“One such problem relates to gender bias. The research we looked at predominantly includes men and not women; this could link to a wider problem with the lack of female scientists in addiction research also. 

“The other issue relates to geographical spread of addiction research; we are missing a large population size in not focusing study in areas outside of America, Europe and Australia. 

“We could gain much more knowledge on the risk of cannabis psychosis by including other countries and cultures.” 

Social factors

The study suggests that more attention needs to be on who is at risk of cannabis psychosis as well as the health implications of taking the drug.  This research has to include more women and countries across Asia, Africa and the Middle East, the researchers argue.

Ian Hamilton added: “We need to accept that cannabis psychosis is about more than genetics or biology but is effected by social factors such as where and how young people grow up and the problems they experience as they develop.” 

Research newsletter

Our monthly research newsletter features a curated mix of news, events, and recent discoveries delivered straight to your inbox.

Sign up

Explore more news

News

11 November 2026

The University of York and NatWest have unveiled a new Life Sciences Business Accelerator to turn academic breakthroughs into real-world health and environmental solutions.

News

10 November 2026

New research has shown that patients who receive care from both NHS and private hospitals need better protection against problems with quality and safety.

News

6 November 2026

The Minister for Science, Innovation and Investment, Chris McDonald MP, visited York’s historic Guildhall to learn how the University is driving economic growth and innovation across the region.

News

6 November 2026

The University of York has officially joined the UK Reproducibility Network (UKRN) as an institutional member, reinforcing its commitment to the highest standards of research rigour, transparency and inclusivity.

News

5 November 2026

The UK Government has lowered a key investment value, known as the headline social discount rate, from 3.5% to 3% following landmark research, giving greater weight to long-term environmental preservation, transport and hospital projects.

Read more news