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Despite the fact that the Drug Enforcement Agency categorizes marijuana as a schedule I drug, one that has no accepted medical use, a majority of Americans have thought medical pot should be legal since the late 1990s — and a majority now support recreational legalization as well.
Washington D.C. and 23 states have legalized medical marijuana (that number is 35 states if we count laws with very limited access).
Even the NIH's National Institute on Drug Abuse lists medical uses for cannabis.
But even though researchers have identified some fascinating potential benefits of medical marijuana so far, it's something that's still hard to study, making conclusive results tough to come by. The schedule I classification means it's hard for researchers to get their hands on pot grown to the exacting standards that are necessary for medical research, even in states where it's legal. Plus, no researcher can even try to make an FDA-approved cannabis product while it has that DEA classification, which removes some motivation to study the plant.
More research would identify health benefits more clearly and would also help clarify potential dangers — like with any psychoactive substance, there are risks associated with abuse, including dependency and emotional issues. And many doctors want to understand marijuana's effects better before deciding whether to recommend it or not.
With that caveat about research in mind, here are some of the medical benefits — or potential benefits — of marijuana.
Weed can be used to treat Glaucoma.
Marijuana use can be used to treat the eye disease glaucoma, which increases pressure in the eyeball, damaging the optic nerve and causing loss of vision.
Marijuana decreases the pressure inside the eye, according to the National Eye Institute: "Studies in the early 1970s showed that marijuana, when smoked, lowered intraocular pressure (IOP) in people with normal pressure and those with glaucoma" — though they still said that pharmaceutical drugs were more effective.
These effects of the drug may slow the progression of the disease, preventing blindness.
It may help reverse the carcinogenic effects of tobacco and improve lung health.
There's a fair amount of evidence that marijuana does no harm to the lungs, unless you also smoke tobacco, and one study published in Journal of the American Medical Association found that marijuana not only doesn't impair lung function, it may even increase lung capacity.
Researchers looking for risk factors of heart disease tested the lung function of 5,115 young adults over the course of 20 years. Tobacco smokers lost lung function over time, but pot users actually showed an increase in lung capacity.
It's possible that the increased lung capacity may be due to taking a deep breaths while inhaling the drug and not from a therapeutic chemical in the drug.
Those smokers only toked up a few times a month, but a more recent survey of people who smoked pot daily for up to 20 years found no evidence that smoking pot harmed their lungs.
It can help control epileptic seizures.
Marijuana use can prevent epileptic seizures in rats, a 2003 study showed.
Robert J. DeLorenzo, of Virginia Commonwealth University, gave marijuana extract and synthetic marijuana to epileptic rats. The drugs rid the rats of the seizures for about 10 hours. Cannabinoids like the active ingredients in marijuana,
tetrahydrocannabinol (also known as THC), control seizures by binding to the brain cells responsible for controlling excitability and regulating relaxation.
The findings were published in the Journal of Pharmacology and Experimental Therapeutics.
It also decreases the symptoms of a severe seizure disorder known as Dravet's Syndrome.
Charlotte Figi has Dravet's Syndrome, and her parents are giving her marijuana to treat her seizures. CNN/WEED
During the research for his documentary "Weed," Sanjay Gupta interviewed the Figi family, who treats their 5-year-old daughter using a medical marijuana strain high in cannabidiol and low in THC.
There are at least two major active chemicals in marijuana that researchers think have medicinal applications (there are up to 79 known active compounds). Those two are cannabidiol (CBD) — which seems to impact the brain mostly without a high— and tetrahydrocannabinol (THC) — which has pain relieving (and other) properties.
The Figi family's daughter, Charlotte, has Dravet Syndrome, which causes seizures and severe developmental delays.
According to the film, the drug has decreased her seizures from 300 a week to just one every seven days. Forty other children in the state are using the same strain of marijuana (which is high in CBD and low in THC) to treat their seizures — and it seems to be working.
The doctors who recommended this treatment say that the cannabidiol in the plant interacts with the brain cells to quiet the excessive activity in the brain that causes these seizures.
As Gutpa notes, a Florida hospital that specializes in the disorder, the American Academy of Pediatrics, and the Drug Enforcement agency don't endorse marijuana as a treatment for Dravet or other seizure disorders.
A chemical found in marijuana stops cancer cells from spreading in the lab.
CBD may also help prevent cancer from spreading, researchers at California Pacific Medical Center in San Francisco reported in 2007.
Cannabidiol stops cancer by turning off a gene called Id-1, the study, published in the journal Molecular Cancer Therapeutics, found. Cancer cells make more copies of this gene than non-cancerous cells, and it helps them spread through the body.
The researchers studied breast cancer cells in the lab that had high expression levels of Id-1 and treated them with cannabidiol. After treatment the cells had decreased Id-1 expression and were less aggressive spreaders. But beware: these are studies on cancer cells in the lab, not on cancer patients.
Other very preliminary studies on aggressive brain tumors in mice or cell cultures have shown that THC and CBD can slow or shrink tumors at the right dose, which is a great reason to do more research into figuring out that dose.
One 2014 study found that marijuana can significantly show the growth of the type of brain tumor associated with 80% of malignant brain cancer in people.
In "WEED," Gupta also mentioned a few studies in the U.S., Spain, and Israel that suggest the compounds in cannabis could even kill cancer cells.
It may decrease anxiety.
Medical marijuana users claim the drug helps relieve pain and suppress nausea — the two main reasons it's often used to relieve the side effects of chemotherapy.
In 2010, researchers at Harvard Medical School suggested that that some of the drug's benefits may actually be from reduced anxiety, which would improve the smoker's mood and act as a sedative in low doses.
Beware, though, higher doses can increase anxiety and make you paranoid.
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