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Posted in Buzz, Reroll
June 6th, 2018

Cannabis and Mental Health

Studies of discordant twins have tested the hypothesis that the association is explained by a shared genetic vulnerability to use cannabis and other illicit drugs. Researchers assessed the association between cannabis and other illicit drug use in monozygotic and dizygotic twin pairs in which one twin had used cannabis before the age of 17 years, and the other had not. The twin who had used cannabis was more likely to have used other illicit drugs than was their co-twin who had not, and the association persisted after controlling for non-shared environmental factors.

Animal studies suggest some ways in which the effects of cannabis could predispose cannabis users to use other illicit drugs.

First, cannabis, cocaine, and heroin all act on the brain reward centre in the nucleus accumbens.Second, the cannabinoid and opioid systems in the brain interact with each other.

Cannabis and mental health
Cannabis use has been associated with increased risk of psychiatric disorders. A 15-year follow-up of over 50,000 male conscripts reported that those who had tried cannabis by age 18 years were 2·4 times more likely to be diagnosed with schizophrenia than those who had not.

Chronic cannabis use can produce a dependence syndrome in as many as one in ten users. Regular users have a higher risk of chronic bronchitis and impaired respiratory function, and psychotic symptoms and disorders, most probably if they have a history of psychotic symptoms or a family history of these disorders. The most probable a dverse psychosocial effect in adolescents who become regular users is impaired educational attainment. Adolescent regular cannabis users are more likely to use other illicit drugs, although the explanation of this association remains contested. Regular cannabis use in adolescence might also adversely affect mental health in young adults, with the strongest evidence for an increased risk of psychotic symptoms and disorders.

Source: Review | www.thelancet.com | Vol 374 October 17, 2009
Adverse health effects of non-medical cannabis Use by Wayne Hall, Louisa Degenhardt

For over two decades, cannabis, commonly known as marijuana, has been the most widely used illicit drug by young people in high-income countries, and has recently become popular on a global scale. Epidemiological research during the past 10 years suggests that regular use of cannabis during adolescence and into adulthood can have adverse effects. Epidemiological, clinical, and laboratory studies have established an association between cannabis use and adverse outcomes. We focus on adverse health effects of greatest potential public health interest—that is, those that are most likely to occur and to affect a large number of cannabis users. The most probable adverse effects include a
dependence syndrome, increased risk of motor vehicle crashes, impaired respiratory function, cardiovascular disease, and adverse effects of regular use on adolescent psychosocial development and mental health.

The Health Effects of Cannabis

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Marijuana and Mental Health

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Marijuana (Cannabis) - Substance Abuse and Mental Health ...

Marijuana, or Cannabis, refers to the dried leaves, flowers, stems, and seeds from the hemp plant Cannabis sativa, which contains the psychoactive (mind-altering) chemical delta-9-tetrahydrocannabinol (THC), as well as other related compounds.

Cannabis and mental health

Readable and up-to-date information on cannabis and mental health from The Royal College of Psychiatrists.

Cannabis and mental health - Rethink Mental Illness, the ...

Cannabis is an illegal drug which can affect your mental health. This section is about the affects that cannabis can have on your mental health. And how to get help and support. You may also find this section useful if you care for someone who uses cannabis ...

Medical cannabis and mental health: A guided systematic ...

Mental health conditions are prominent among the reasons for medical cannabis use. • Cannabis has potential for the treatment of PTSD and substance use disorders.

Effects of cannabis - Wikipedia

The effects of cannabis are caused by the chemical compounds in the plant, including cannabinoids, such as tetrahydrocannabinol (THC), which is only one of more than 100 different cannabinoids present in the plant.

Learn About Marijuana: Factsheets: Mental Health and Marijuana

Mental Health and Marijuana The link between the use of marijuana and mental health problems is an issue that receives a great deal of attention in the research and general media.

Medical and Recreational Marijuana: How They Affect Your ...

Marijuana has some well-proven benefits, including relief for long-term pain. But smoking marijuana can have some bad effects on your health, including making breathing problems worse.

Does cannabis cause mental illness? - The Conversation

Cannabis is the most commonly used illicit drug in Australia, with one in three adults using it at some point in their life. It’s legal in some places around the world, and offered medicinally in others. But what does smoking pot do to your mental health? The potential harms associated with using ...

Cannabis & psychosis - SANE Australia

Cannabis (marijuana, hashish, weed, dope) is the most commonly used illicit recreational drug in Australia. It’s a depressant psychoactive substance that can cause temporary psychotic symptoms and, in some cases, full psychotic disorders like schizophrenia.

Cannabis (drug) - Wikipedia

Cannabis, also known as marijuana among other names, is a psychoactive drug from the Cannabis plant intended for medical or recreational use. The main psychoactive part of cannabis is tetrahydrocannabinol (THC); one of 483 known compounds in the plant, including at least 65 other cannabinoids.

Treatment for cannabis addiction common, says addiction and mental health director

Treatment for cannabis addiction common, says addiction and mental health director

June 3, 2018 - Toronto Star

EDMONTON—With cannabis legalization on the horizon, Alberta Health Services is trying to grapple with how and where people can use the substance — but also how they can help people quit if they want to stop using it. “It does worry me,” said AHS...

Advocates call for research into effects of cannabis on mental health

Advocates call for research into effects of cannabis on mental health

May 25, 2018 - CTV News

A group of advocates is calling for more research into the effects of cannabis-use on mental health as part of National Schizophrenia and Psychosis Awareness Day. “There's no ifs. There's no doubt. The research from the last 30 years and especially the...

All eyes on Canada as first G7 nation prepares to make marijuana ...

All eyes on Canada as first G7 nation prepares to make marijuana ...

June 6, 2018 - The Guardian

From crime to health to business, Canada's decision to legalize marijuana is a grand progressive experiment that promises to answer a host of questions....

Canopy Growth to fund Professorship of Cannabis Science at University of British Columbia to research the role of ...

June 6, 2018 - New Cannabis Ventures

Through an investment from the British Columbia Ministry of Mental Health and Addictions towards research leading to solutions to the overdose crisis, the BCCSU will contribute an additional CDN $500,000 in funds held at the St. Paul's Foundation....

Why we must legalise cannabis now for the sake of public health

Why we must legalise cannabis now for the sake of public health

June 2, 2018 - The Guardian

Health Poverty Action's new report highlights cannabis as an untapped revenue stream for the NHS, calculating that this would pay for every midwife in England, with money left over to fund drug education, harm reduction and mental health services....

Cannabis-Induced Psychosis: Real or Reefer Madness?

Cannabis-Induced Psychosis: Real or Reefer Madness?

May 24, 2018 - Leafly

Dr. Romina Mizrahi, director of the Focus on Youth Psychosis Prevention Clinic at The Centre for Addiction and Mental Health in Toronto told that “cannabis could be a trigger of an underlying condition.” She added that, although “there is a...

The Therapeutic Cannabis User: 5 Key Issues

The Therapeutic Cannabis User: 5 Key Issues

May 30, 2018 - Psychiatric Times

The current use of cannabis for mental health conditions departs from the traditional paradigm of prescribed medications for clinical practice in 2 specific areas. First, doctors cannot base their treatment plans on high quality clinical trials. Second...

High time India, the land of bhang, legalises marijuana: Shashi Tharoor

High time India, the land of bhang, legalises marijuana: Shashi Tharoor

June 5, 2018 - ThePrint

Before we go further, it is important to note that cannabis is by no means harmless. While many people who use it will not experience serious harms, research suggests that it can trigger or exacerbate certain mental health issues for some people. Those...

The UK is the largest exporter of medical marijuana – now we just need to decriminalise it completely

The UK is the largest exporter of medical marijuana – now we just need to decriminalise it completely

June 3, 2018 - The Independent

While most cannabis forms are relatively benign – and incomparably less harmful than legal drugs such as tobacco, alcohol, diazepam and refined sugar – the strain known as “skunk” is a serious danger to the mental health of young people with unformed...

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