Featured Research

from universities, journals, and other organizations

Cannabis-related Schizophrenia Set To Rise, Say Researchers

Date:
March 26, 2007
Source:
Bristol University
Summary:
If cannabis causes schizophrenia - and that remains in question - then by 2010 up to 25 per cent of new cases of schizophrenia in the UK may be due to cannabis, according to a new study.

If cannabis causes schizophrenia - and that remains in question - then by 2010 up to 25 per cent of new cases of schizophrenia in the UK may be due to cannabis, according to a new study by Dr Matthew Hickman of the University of Bristol and colleagues, published in Addiction journal.

Related Articles


Substantial increases in both prevalence and incidence of the disease are forecast by the end of the decade, with increases in schizophrenia starting earlier among young men in particular.

The research study matches historic trends in cannabis use and exposure from a national population survey against estimates of new occurrences of schizophrenia in three English cities (Nottingham, Bristol and the London Borough of Southwark). 

The researchers assess what might happen to schizophrenia cases if we assume a causal link between cannabis use and onset of psychotic symptoms, an association widely recognised by some psychiatrists and researchers and considered recently by the Advisory Council on the Misuse of Drugs.

Exposure to cannabis grew fourfold over the thirty years to 2002, and its use among under-18s by 18-fold, say the researchers.  If cannabis use causes schizophrenia, these increases in its use would lead to increases in overall schizophrenia incidence and prevalence of 29 per cent and 12 per cent respectively, between 1990 and 2010.  (Incidence is defined as the frequency of new occurrences; and prevalence is the percentage of the population affected by the disease.)

Model projections suggest that if the association is confined to heavy cannabis users only, then approximately 10 per cent of schizophrenia cases may be due to cannabis by 2010.  However, assuming an association between onset of the disease and both light and heavy users, then approximately one-quarter of new cases could be due to cannabis. 

John Macleod, co-author and academic GP, said: “We need to remember that our study does not address the question whether cannabis causes schizophrenia: this remains unclear.”

Matthew Hickman, lead author of the study, added: “The challenge now is to improve our data on schizophrenia occurrence to see whether the projected increase occurs.  This will tell us more about how important cannabis is as a cause of schizophrenia.”

Reference: Matthew Hickman, Peter Vickerman, John Macleod, James Kirkbride, Peter B. Jones.  Cannabis and schizophrenia: model projections of the impact of the rise in cannabis use on historical and future trends in schizophrenia in England and Wales (2007).  Addiction 102 (4), 597-606.


Story Source:

The above story is based on materials provided by Bristol University. Note: Materials may be edited for content and length.


Cite This Page:

Bristol University. "Cannabis-related Schizophrenia Set To Rise, Say Researchers." ScienceDaily. ScienceDaily, 26 March 2007. <www.sciencedaily.com/releases/2007/03/070324132832.htm>.
Bristol University. (2007, March 26). Cannabis-related Schizophrenia Set To Rise, Say Researchers. ScienceDaily. Retrieved November 29, 2014 from www.sciencedaily.com/releases/2007/03/070324132832.htm
Bristol University. "Cannabis-related Schizophrenia Set To Rise, Say Researchers." ScienceDaily. www.sciencedaily.com/releases/2007/03/070324132832.htm (accessed November 29, 2014).

Share This


More From ScienceDaily



More Mind & Brain News

Saturday, November 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Tryptophan Isn't Making You Sleepy On Thanksgiving

Tryptophan Isn't Making You Sleepy On Thanksgiving

Newsy (Nov. 27, 2014) — Tryptophan, a chemical found naturally in turkey meat, gets blamed for sleepiness after Thanksgiving meals. But science points to other culprits. Video provided by Newsy
Powered by NewsLook.com
Are Female Bosses More Likely To Be Depressed?

Are Female Bosses More Likely To Be Depressed?

Newsy (Nov. 24, 2014) — A new study links greater authority with increased depressive symptoms among women in the workplace. Video provided by Newsy
Powered by NewsLook.com
Winter Can Cause Depression — Here's How To Combat It

Winter Can Cause Depression — Here's How To Combat It

Newsy (Nov. 23, 2014) — Millions of American suffer from seasonal depression every year. It can lead to adverse health effects, but there are ways to ease symptoms. Video provided by Newsy
Powered by NewsLook.com
Could Your Genes Be The Reason You're Single?

Could Your Genes Be The Reason You're Single?

Newsy (Nov. 21, 2014) — Researchers in Beijing discovered a gene called 5-HTA1, and carriers are reportedly 20 percent more likely to be single. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins