Written By: Michelle Whitmer, Last modified: February 9, 2021

Using Marijuana for Pain & Treatment Side Effects

Although the sale and use of marijuana as a recreational substance is a federal offense in the U.S., as of June 25, 2019, it is approved in 11 states and the District of Columbia for recreational use and in 33 states for medicinal purposes — particularly for treating pain associated with cancer and for nausea and loss of appetite associated with chemotherapy treatment.

Patients with mesothelioma cope with symptoms of the disease and side effects of cancer treatment such as chest pain and chemotherapy-induced nausea. A number of clinical trials found evidence that medical marijuana may help some patients manage cancer-related symptoms and side effects of cancer treatment.

As with all forms of herbal medicine, patients should consult with their oncologist before using this type of complementary treatment because it may interfere with conventional treatments.

Benefits and Side Effects of Medical Marijuana

In clinical trials, medical marijuana was found effective for:

  • Pain relief
  • Nausea relief
  • Reduced vomiting
  • Improved appetite
  • Improved sleep quality
  • Anxiety relief

Despite its benefits, medical marijuana may also have side effects, including:

  • Rapid heartbeat
  • Low blood pressure
  • Muscle relaxation
  • Bloodshot eyes
  • Slowed food digestion
  • Dizziness
  • Paranoia

Patients report that side effects are generally mild, but vary depending on the strain of marijuana and how much is consumed. Researchers have not reported benefits or side effects of marijuana as a treatment for mesothelioma.

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Scientific Research on Medical Marijuana in Cancer Care

Most of the scientific research on medical marijuana in cancer care has happened outside of the U.S. because marijuana remains illegal at the federal level. Growing support for legalization of medical marijuana may promote cancer research in the future, but current research is limited in the U.S.

Global research efforts have increased in recent years because of a growing interest in the potential role of medical marijuana in cancer care. The research extends beyond the well-known tetrahydrocannabinol chemical, known as THC, to include other compounds, such as CBD, collectively known as cannabinoids.

The research has looked at marijuana not only as a means to control cancer symptoms and treatment side effects, but also as an anti-cancer therapy. Studies in test tubes and in mice indicate that several types of cancer may respond to cannabis as an anti-cancer therapy. Some cancer cells die when exposed to cannabinoids, and some stop spreading.

It appears that certain cancer cells actually have cannabinoid receptors, but the precise function remains largely unknown. There isn’t enough research on how marijuana affects mesothelioma tumor progression.

Medical Marijuana Research for Cancer Symptoms & Treatment Side Effects

  • In 2019, Expert Opinion on Investigational Drugs published a review of the medical literature on the use of medical marijuana in cancer care. It found evidence that it may help cancer patients cope with chemotherapy-induced nausea and vomiting, cancer-related pain, anorexia and cachexia syndrome, insomnia and anxiety.
  • In 2018, Current Pain Headache Reports published a review of randomized, controlled clinical trials involving medical cannabis for neuropathic pain, which is a common side effect of chemotherapy. Over the last 20 years, about a dozen clinical trials reported significant relief of neuropathic pain using marijuana over a placebo. The results and tolerability of marijuana for neuropathy was found comparable to prescription drugs.
  • In 2015, Cochrane Database of Systematic Reviews published a review of 23 randomized, controlled clinical trials involving cancer patients receiving medical marijuana for nausea and vomiting caused by chemotherapy. The study reported that patients receiving marijuana experienced less nausea and vomiting than patients receiving a placebo.

It also reported that marijuana controlled nausea and vomiting just as well as conventional anti-nausea drugs, and the patients who received both preferred marijuana over anti-nausea drugs. However, patients receiving marijuana were more likely to drop out of the trials because of side effects (such as dizziness or sedation) than patients receiving placebos or anti-nausea drugs.

Research on Medical Marijuana as an Anti-Cancer Therapy

  • A 2016 study published in Progress In Neuro-Psychopharmacology & Biological Psychiatry found THC and other cannabinoids can kill cancer cells and limit their spreading. The study also noted research in animals that showed cannabis enhanced the effect of cancer drugs designed to stop tumor growth and spreading.
  • A 2016 study published in Current Oncology found THC and CBD limited the growth of neuroblastoma in test tube studies and mice studies. Of the two cannabinoids, CBD was more active against this cancer.
  • A 2014 study published in Oncotarget reported certain cannabinoid compounds in medical marijuana can kill a variety of cancer cells and block them from spreading. Researchers cited studies showing cannabinoids having anti-cancer effects in the following cancers: Lung, breast, prostate, skin, pancreatic, brain, bone, oral, thyroid and lymphoma.

Cannabinoids May Promote Tumor Growth

It is important to note some laboratory research indicates cannabinoids may promote tumor growth in certain cancers. For example, a 2004 test tube study published in Cancer Research found THC promoted the growth of lung cancer and glioblastoma, a type of brain cancer.

A 2005 test tube study published in The Journal of Immunology found THC enhanced the growth and spreading of breast cancer. In 2000, the same journal published a study on mice with lung cancer and found THC accelerated tumor growth by limiting parts of the immune system that control cancer.

Further research in humans is required to fully understand how the chemicals in marijuana affect different types of cancer.

Edible Medical Marijuana

Patients with mesothelioma or lung cancer have weakened lungs and experience trouble breathing. For these patients, consuming edible marijuana may be preferable to smoking it to avoid aggravation of lung tissues.

There are some differences between smoked and edible marijuana:

  • When marijuana is inhaled, the effects are felt almost immediately. When eaten, it takes longer to take effect because of the digestive process. The effect can take from 20 minutes to two or more hours to be fully felt, but the average time is around 90 minutes.
  • Many patients find the psychoactive effects of edible marijuana are milder and the body relief is stronger. This is sometimes more effective for cancer patients who seek relief from physical symptoms. The effects may also last longer.

Edible medical marijuana comes in a variety of types:

  • The most popular and most recognizable forms of edible marijuana are baked goods. Items such as brownies and cookies are made with cannabis-infused butter. Hash oil or hash-infused butter tends to have a higher concentration of marijuana, so less cannabis can be used, making the flavor milder. This type of marijuana can also be made into chocolates.
  • Other edibles include hard candies, cold drinks and teas. It is important to follow dosing instructions carefully and not overeat marijuana edibles. Patients are recommended to start with a very small dose to gauge the effects.

For patients who are watching calories, fat or sugar, there are alternatives to heavy baked goods:

  • Tinctures are placed under the tongue for a short amount of time and then swallowed. According to some patients, the effect of tinctures is less sedating than edibles made with cannabis butter, and it is absorbed more quickly.
  • Cannabis capsules usually contain a mix of cannabis and other oils, or other oils infused with cannabis. Patients take these like they would any other pill.

For patients who don’t prefer edibles, topical marijuana products are becoming more widely available:

  • Topical products are primarily used to reduce body pain and inflammation in the area they are applied. This may help mesothelioma patients experiencing cancer-related pain such as chest pain or bone pain caused by growing tumors.
  • Some states that haven’t enacted medical marijuana laws allow the sale of non-psychoactive cannabinoid products such as CBD topical creams.
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Synthetic THC

Since marijuana is not readily available to many patients, drug companies have developed synthetic versions of THC, the psychoactive ingredient in marijuana.

  • A synthetic form of THC called Marinol (dronabinol) was approved by the U.S. Food and Drug Administration (FDA) as an appetite stimulant and for nausea.
  • Cesamet (nabilone) is another drug that contains a synthetic cannabinoid similar to THC that was approved to treat nausea and vomiting caused by chemotherapy.

Patients who have tried synthetic and natural versions of marijuana often say marijuana in its natural form is more effective for symptom relief than the synthetic variety. Marinol and Cesamet can also have serious side effects that aren’t a risk with natural THC, including seizures, irregular heartbeat, vision changes, headaches and severe or persistent dizziness.

Regulation and Legalization of Medical Marijuana

Regulations on marijuana began in the early 1900s.

Various pieces of legislation affected the regulation and criminalization of marijuana such as:

  • Harrison Narcotics Act
  • Marihuana Tax Act of 1937
  • Boggs Act
  • Narcotics Control Act
  • Controlled Substances Act

In 1970, the Controlled Substances Act classified marijuana as a Schedule I substance having “no accepted medical use.”

The country’s attitude toward medical marijuana began to shift in the late 1970s. In 1978, the National Institute on Drug Abuse (NIDA) supplied seven patients with marijuana after their physicians applied for the Expanded Access (compassionate use) program.

In 1991, 53% of oncologists agreed that marijuana should be available by prescription and 66% said it helped cancer patients treat the side effects of chemotherapy.

The New England Journal of Medicine published an editorial calling for the rescheduling of marijuana in 1997, and in 2008 the American College of Physicians stated that it supported non-smoked THC. The organization also called for exemption from criminal prosecution for patients.

After California legalized the drug in 1996, other states followed. Presently, 33 states, the District of Columbia, Guam, Puerto Rico and the U.S. Virgin Islands have legalized medical marijuana.

Recreational marijuana became legal to purchase in Colorado and Washington in 2014. Since then, a total of 11 states and one territory have approved recreational marijuana.

States That Have Legalized Recreational Marijuana

  • Alaska
  • California
  • Colorado
  • District of Columbia
  • Illinois
  • Maine
  • Massachusetts
  • Michigan
  • Nevada
  • Oregon
  • Vermont
  • Washington

States That Have Legalized Medical Marijuana

Statepossession Limit
Alaska1 oz usable; 6 plants (3 mature, 3 immature)
Arizona2.5 oz usable; 12 plants
Arkansas2.5 oz usable per 14-day period
California8 oz usable; 6 mature or 12 immature plants
Colorado2 oz usable; 6 plants (3 mature, 3 immature)
Connecticut2.5 oz usable
District of Columbia2 oz useable; 6 plants (3 mature, 3 immature)
Delaware6 oz usable
Florida35-day supply (amount not specified)
Hawaii4 oz usable; 10 plants
Illinois2.5 oz of usable cannabis during a 14-day period
Maine2.5 oz usable; 6 plants
Maryland30-day supply; no more than 120 grams (approximately 4 oz)
Massachusetts60-day supply (10 oz)
Michigan2.5 oz usable; 12 plants
Minnesota30-day supply of non-smokable marijuana
Montana1 oz usable; 4 plants (mature); 12 seedlings
Nevada2.5 oz usable; 12 plants
New Hampshire2 oz of usable cannabis during a 10-day period
New Jersey2 oz usable
New Mexico6 oz usable; 16 plants (4 mature, 12 immature)
New York30-day supply of non-smokable marijuana
North Dakota3 oz per 14-day period
OhioMaximum of a 90-day supply; amount to be determined
Oregon (only state to accept out-of-state applications)24 oz usable; 24 plants (6 mature, 18 immature)
Pennsylvania30-day supply
Rhode Island2.5 oz usable; 12 plants
Utah113 grams of unprocessed cannabis
Vermont2 oz usable; 9 plants (2 mature, 7 immature)
Washington8 oz usable; 6 plants
West Virginia30-day supply

Talk with Your Oncologist

If you live in a state that offers medical marijuana, ask your oncologist how it might benefit or interfere with your treatment plan. People assume it couldn’t hurt to take a natural substance, but cannabis products contain antioxidants that may protect cancer cells from the wanted effects of chemotherapy and radiation therapy.

This means certain types of medical marijuana might have the potential to block your anti-cancer treatments from working properly. Your oncologist is your best resource for guidance on this matter.

A number of mesothelioma survivors have said they spoke with their doctor before using medical marijuana as a complementary therapy to conventional treatment, which is known as integrative oncology.

Medical Marijuana Experiences for Mesothelioma Survivors

  • One mesothelioma survivor, Andy Ashcraft, said he used cannabis oil for years and believed it helped him cope with mesothelioma. His wife and caregiver thoroughly researched how to dose and administer cannabis oil to cancer patients before Andy began taking it.
  • Another survivor, Pete K., said he used edible medical marijuana to lessen the side effects of chemotherapy.
  • California resident and mesothelioma survivor Jim Huff said he uses cannabis oils to control his cancer and promote sleep.

While research shows medical marijuana may help cancer patients cope with pain, nausea, anxiety, lack of appetite and insomnia, it is best to discuss how you want to use marijuana with your doctor to get their approval first and make sure you take the right product, at the right time, without interfering with your treatment plan.


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