Navigation Links
Marijuana Use Can Up Psychosis Risk

Study found the longer teens smoked, the more their mental health suffered

SATURDAY, Feb. 27 (HealthDay News) -- Long-term use of marijuana can lead to increased risk of developing hallucinations, delusions and psychosis, a new study shows.

Australian researchers asked nearly 3,100 young adults averaging about 20 years of age about marijuana use. They found that almost 18 percent reported using the drug for three or fewer years, about 16 percent for four to five years, and just over 14 percent for six or more years.

Among the participants, 65 had been diagnosed with a "non-affective psychosis" such as schizophrenia, and 233 had at least one positive item for hallucination on a diagnostic interview conducted for the study.

The researchers found there was an association between length of marijuana use and mental health.

"Compared with those who had never used cannabis, young adults who had six or more years since first use of cannabis [i.e., who commenced use when around 15 years or younger] were twice as likely to develop a non-affective psychosis and were four times as likely to have high scores on the Peters et al Delusions Inventory [a measure of delusion]," wrote Dr. John McGrath, of the Queensland Centre for Mental Health Research, Park Centre for Mental Health in Wacol, and colleagues. "There was a 'dose-response' relationship between the variables of interest: the longer the duration since the first cannabis use, the higher the risk of psychosis-related outcomes."

The study appears online March 1 and in the May print issue of the Archives of General Psychiatry.

But the association between psychosis and marijuana use is not simple, the researchers noted. They found that people who'd experienced hallucinations earlier in life were also more likely to have used marijuana longer and to use it more frequently.

"This demonstrates the complexity of the relationship: those individuals who were vulnerable to psychosis [i.e., those who had isolated psychotic symptoms] were more likely to commence cannabis use, which could then subsequently contribute to an increased risk of conversion to a non-affective psychotic disorder," wrote the study authors.

Further research is needed to learn more about the mechanisms underlying the association between psychosis and marijuana use, they concluded.

More information

The U.S. National Institute on Drug Abuse has more about marijuana.

-- Robert Preidt

SOURCE: JAMA/Archives journals, news release, March 1, 2010

Copyright©2010 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. International Merchant Advisors CEO Mel Roseman to Discuss New Medical Marijuana Clinics Live on CBS Radio Networks Big Biz Show February 22, 2010 at 1:40 pm PST
2. International Merchant Advisors Inc. to Open New Wellness Centers With Medical Marijuana Treatment Facilities
3. UC studies show marijuana has therapeutic value, reports to legislature
4. Marijuana ineffective as an Alzheimers treatment: UBC-Vancouver Coastal Health research
5. 215 Agenda Medical Marijuana Collective Located in Lake Forest, CA, has Donated $1,500 to Friends of the El Toro Library
6. Medical Marijuana Super Store Opens in East Oakland
7. Marijuana Compounds Could Beat Back Brain Cancer
8. Marijuana Munchies May Be Rooted in Biology
9. Teen Marijuana Use Might Have Lasting Effects on Mood, Anxiety
10. Pot and pop: New research finds stronger link between music and marijuana use among teens
11. Marijuana, Alcohol Addiction May Share Genes
Post Your Comments:
(Date:11/25/2015)... ... ... “While riding the bus, I saw a passenger in a wheelchair drenched from ... a convenient and comfortable way to protect them from bad weather, so I invented ... during cold or inclement weather. In doing so, it ensures that the user remains ...
(Date:11/25/2015)... ... 2015 , ... Privately owned Contract Development and Manufacturing Organization ... current state of the art research, development and manufacturing facility outside of Fort ... capacity as well as to support its clients’ growing research and development and ...
(Date:11/25/2015)... (PRWEB) , ... November 25, 2015 , ... Students and ... were awarded to winners of the Create Real Impact awards. California Casualty ... to help stem the tide of distracted and reckless driving, the number one killer ...
(Date:11/24/2015)... ... November 24, 2015 , ... New patients who wish to seek treatment ... dental implants at her Mississauga, ON practice. Dr. Williams has been providing dental ... dental implants. , Missing teeth can lead to a variety of complications if ...
(Date:11/24/2015)... ... November 25, 2015 , ... Catalent Pharma Solutions, ... biologics, consumer health and global clinical supply services, today announced that Dr. Christine ... Supply East Asia Conference, to be held at the InterContinental Seoul COEX Hotel, ...
Breaking Medicine News(10 mins):
(Date:11/24/2015)... 25, 2015 WuXi PharmaTech (Cayman) Inc. ("WuXi" ... open-access R&D capability and technology platform company serving the ... China and the ... extraordinary general meeting of shareholders held today, the Company,s ... and approve the previously announced agreement and plan of ...
(Date:11/24/2015)... N.C. , Nov. 24, 2015  In the ... projects in an effort to quickly uncover new insights, ... --> --> However, ... a market research project and ensure that all rules ... and industry standards. Another major barrier to efficiently launching ...
(Date:11/24/2015)... Va. , Nov. 24, 2015  DILON Diagnostics ... have signed an agreement for DILON to distribute GE,s ... across the globe. The signing of this distribution agreement will ... NM750b Molecular Breast Imaging system and is considered an ... provide better healthcare solutions for clinicians and their patients. ...
Breaking Medicine Technology: