HEALTH: Comprehensive health benefits, risks of cannabis use.

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With cannabis legalisation on the rise across the world especially in the United States (U.S.), it is more important than ever to get a clear understanding of the drug’s health benefits and risks. In a new report from the US National Academies of Sciences, Engineering, and Medicine, researchers analysed more than 10,000 scientific studies on cannabis and cannabis-derived products in order to help meet this need, and they came to some interesting conclusions.

The researchers conclude that cannabis could be beneficial for chronic pain, but it may increase the risk of mental health problems.

Cannabis is a drug derived from the plant Cannabis sativa. It is most commonly used in the form of marijuana, which is produced from the dried leaves of the cannabis plant.

Marie McCormick, chair of the National Academies of Sciences, Engineering, and Medicine committee told Medical News Today that the increased legalization of cannabis and its derivatives is making the drug more accepted and accessible. This has led to increased use, which has “raised important public health concerns.”

Cannabis: How does it impact health?
With this in mind, McCormick and colleagues from the National Academies of Sciences, Engineering, and Medicine committee analyzed the data of more than 10,000 scientific studies on the health effects of cannabis and cannabis-derived products – including marijuana and cannabinoids, the active components of cannabis – that had been published since 1999.

Specifically, the researchers looked at the therapeutic potential of cannabis and its derivatives, as well as the health risks associated with its use. Medical News Today takes a look at some of the key findings.

The researchers recently published their results in a report titled “The health effects of cannabis and cannabinoids: The current state of evidence and recommendations for research (2017).”

‘Substantial evidence’ that cannabis treats chronic pain
Chronic pain is estimated to affect more than 25 million U.S. adults, and it is a leading cause of disability.

When it comes to medicinal cannabis, one of its key uses is for the treatment of chronic pain. In the new report, researchers found that patients with chronic pain who were treated with cannabis or products containing cannabinoids were more likely to report significant pain relief than untreated patients. Based on their analysis, the National Academies of Sciences, Engineering, and Medicine conclude: “There is substantial evidence that cannabis is an effective treatment for chronic pain in adults.”

Cannabis use may harm mental health
A number of studies have suggested that cannabis use can have negative implications for mental health, and from their scientific review, the National Academies of Sciences, Engineering, and Medicine conclude that this is the case.

Additionally, “moderate evidence” suggests that frequent users of cannabis may be more likely to report suicidal thoughts and that regular use of the drug could increase the risk of social anxiety disorder. Cannabis use may also pose a “small increased risk” for the development of depressive disorders.

However, the researchers conclude that there is “limited evidence” of a statistical link between cannabis use and the development of bipolar disorder, and there is “no evidence” to either support or refute a statistical link between cannabis use and the development of post-traumatic stress disorder.

Cannabis and cancer risk
It is well established that smoking tobacco can increase the risk of lung, head, and neck cancers, and some studies have suggested that smoking cannabis can do the same. The new report, however, concludes that there is no evidence of a statistical link between cannabis use and the risk of lung cancer and head and neck cancers.

The researchers uncovered “moderate evidence” of a link between cannabis use and one subtype of testicular cancer – seminoma testicular cancer, a slow-growing form of the disease.

Furthermore, the team found no evidence of a link between marijuana use in pregnancy and cancer risk in offspring.

In relation to nausea and vomiting caused by chemotherapy, the researchers found that the use of cannabinoids may help to treat or prevent these symptoms.

Recommendations for future cannabis research
While the new report helps to clarify some of the benefits and risks of using cannabis and its derivatives, the National Academies of Sciences, Engineering, and Medicine say that further research is warranted.

The organization makes a number of recommendations for future studies into the health effects of cannabis use. These include:
*Researchers should assess the health effects of cannabis use in children and adolescents, as this population is understudied
*Well-controlled studies that investigate the possible benefits and harms of different forms of cannabis, such as oral cannabis and inhaled whole cannabis, should be conducted
*Studies should assess the potential benefits and risks of currently understudied cannabis products, such as edible and topical cannabis.

Additionally, the authors of the report say that efforts should be made to break down the barriers currently preventing more advanced research into the health effects of cannabis use, such as cannabis being classified as a Schedule I substance. This classification states that the drug has a high potential for abuse and has no accepted medical use.

“To ensure that policymakers are better informed to make decisions on cannabis research and policy, and to explore and characterize the full scope of political and non-political strategies for resolving regulatory barriers to cannabis research, an objective and evidence-based analysis of cannabis policy is necessary,” say the report authors.

Meanwhile, a 44-year-old cancer patient claims cannabis oil helped to reduce the size of a hole in his cheek caused by the disease. The unnamed man was diagnosed with oral cancer in 2013 and underwent treatment to remove the deadly cells.

Despite initially working, the disease returned three years later and had even eroded a hole in his cheek. But after using cannabis oil directly on his wound, it helped stop it from expanding and even shrank it by around 5 per cent, it is reported. While each of his four daily doses also helped to give him around two hours of pain relief, according to a case report.

Published in the Journal of Pain and Symptom Management, it explains how the patient visited a palliative-care clinic in Toronto in 2016.

But after it had returned he had decided he would no longer seek further treatment to treat the disease.

Complaining of pain, he was given opiod-based medications. However, these proved to be unsuccessful.

Does cannabis oil work? Cannabis oil is made up of THC and CBD – the two primary ingredients in the plant. It can either be orally ingested, vapourised or applied directly to the skin.

CBD is considered a medicine by the United Kingdom’s (UK’s) regulatory body, the MHRA, after it was found to have a ‘restoring, correcting or modifying’ effect when given to humans.

While THC – which is responsible for the high – was found to help relieve pain in patients in a study by University of California researchers in 2012.

Dr. Kat Arney, from Cancer Research UK, previously said: “We know that cannabinoids can have a range of different effects on cancer cells grown in the lab and animal tumours.

“But at the moment there isn’t good evidence from clinical trials to prove that they can safely and effectively treat cancer in patients.”

Causing him to become drowsy, the main then asked Dr. Vincent Maida, who helps to run the end-of-life unit at the University of Toronto for medical marijuana to alleviate his discomfort.

Using it in his vapourised form, he was forced to stop inhaling it when the disease created a hole in his cheek. Seeking pain relief, the man then asked for a prescription to use medical cannabis oil.

Applying it directly to his wound, it was found to relieve his pain and helped to shrink the hole. However, his condition deteriorated and he was admitted to hospital before passing away three weeks later.

Cannabis oil is made up of both cannabidiol (CBD) and tetrahydrocannabinol (THC) – the two main extracts from the plant.

Despite the latter often being overlooked in terms of its health benefits, the former is deemed a medicine in the UK.

In October, the regulatory body found CBD had a ‘restoring, correcting or modifying’ effect on physiological functions when administered to humans.

But the Class B drug itself was not recognised as having any benefits and is still illegal to possess.

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