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With the worldwide death toll from the corona virus rising exponentially, The Lancet drew attention to “accumulating evidence” that indicates “patients with severe COVID-19 might have a cytokine storm syndrome.”

Characterized by intense immune overreaction in the lungs, this little understood syndrome can sicken and kill infected individuals. Respiratory distress is the leading cause of mortality in COVID-19 cases. The critically ill who survive intensive care may suffer long term lung damage, resulting in functional impairment and reduced quality of life.

Science Daily reports that a hyper-inflammatory cytokine storm, involving a surge of immune cells gone haywire, was likely the primary cause of death in several viral outbreaks, including the 1918-20 “Spanish flu” pandemic (which killed more than 50 million people) and, more recently, the H1N1 swine flu and the so-called bird flu.

In cases of acute, viral-induced pulmonary distress, cytokine-storm-targeted therapy would seem to make sense. But treatment with corticosteroids is not a great option because it can exacerbate COVID-19-associated lung injury. “However,” as The Lancet emphasizes, “in hyperinflammation, immunosuppression is likely to be beneficial.”


Several laboratory studies indicate that cannabinoid compounds – in particular, cannabidiol (CBD) and tetrahydrocannabinol (THC) – are immunosuppressant. This would explain why medical cannabis is beneficial for people with autoimmune diseases and chronic inflammation.

Which begs the question: Could cannabis calm a cytokine storm? 

The short answer is we don’t know. There’s a lot that we still don’t understand about cannabis and the immune system.

For many years, scientific inquiry in the United States has been handcuffed by cannabis prohibition, and the federal government continues to thwart research that could shed light on the therapeutic use of cannabis and whole plant CBD-rich oil extracts. The federal stranglehold on cannabis research is the main reason why we know so little about CBD’s clinical potential as an antiviral remedy.

Cannabis prohibition is exacerbating the current crisis in other ways, as well, as we discuss later in this article. For now, let’s turn our attention back to cytokines and cannabinoids. 

CBD acts as a potent anti-inflammatory, reducing cytokine production and inhibiting immune cell function.


Secreted by immune cells, cytokines are a group of proteins that regulate inflammatory responses to disease and infection. There are both pro-inflammatory and anti-inflammatory cytokines.

Overproduction or excess secretion of pro-inflammatory messenger molecules can trigger a dangerous cytokine storm and other aberrant conditions. A cytokine known as tumor necrosis factor alpha (TNFa), for example, is produced in excess in rheumatoid arthritis, a painful, autoimmune disease that afflicts 1.3 million Americans.

The interaction between cytokines, immune cells, and the endogenous cannabinoid system plays an important role in neuroinflammation and neurodegeneration.

It’s well documented that stimulation of the CB2 cannabinoid receptor by THC and its endogenous counterparts can suppress inflammation. Cannabinoid receptor signaling confers therapeutic effects by downregulating inflammatory cytokine expression.

Although cannabidiol has little direct binding affinity for the CB2 receptor, CBD also acts as a potent anti-inflammatory, reducing cytokine production and inhibiting immune cell function.


What does this mean, practically speaking, for those who are using (or who might consider using) CBD or cannabis during the COVID-19 pandemic? Will consuming small amounts of CBD or cannabis as a preventive measure help to strengthen our immune resistance, or could it make us more susceptible to the corona virus? If one is infected, would CBD increase or diminish the risk of severe disease progression? Would CBD have any impact at all?

The International Association for Cannabinoid Medicine (IACM), based in Germany, issued a statement on the COVID-19 pandemic and the use of cannabinoids, noting that some laboratory studies suggest that cannabinoids may have antiviral effects. “However,” according to the IACM, “there is no evidence that individual cannabinoids – such as CBD, CBG or THC – or cannabis preparations protect against infection … or could be used to treat COVID-19, the disease produced by this virus.”

But the IACM also emphasizes “there is no evidence that the use of cannabinoids could increase the risk of viral infection.”

Project CBD, a U.S. ambassador of the IACM, endorses the association’s call for “solidarity during this time, especially with those who are particularly at risk from such an infection.” Don’t share “false information that is circulating on the Internet,” the IACM implores. “Help contain the spread of the virus by following government and health authority guidelines.”

There have been reports of people stockpiling cannabis products obtained from licensed dispensaries and delivery services in U.S. states where cannabis is legal for therapeutic and/or adult use. Several state governments have followed California’s lead by declaring that cannabis businesses are essential services that can stay open, while the pandemic prompted lockdowns and closures in hard-hit areas.

But cannabis remains illegal under federal law, and cannabis prohibition is making a terrible situation even worse. The pandemic has magnified the damage wrought by U.S. drug policy, which continues to stymie scientific inquiry and impede medical advances by blocking therapeutic-oriented cannabis research. Consequently, we don’t have clear answers to key questions about cannabinoids and viral infections at a time of dire need. 


Cannabis prohibition is also introducing needless public health risks in other areas. Because of the plant’s criminal status at a federal level, banks are prohibited from opening accounts and issuing credit cards to cannabis businesses. Even legitimate, state-licensed companies are forced to operate on a cash-only basis, a practice that puts frontline dispensary staff, other industry workers, and state tax collectors at risk. Handling cash can be dangerous during the pandemic.

According to The New England Journal of Medicine, the corona virus “is stable for several hours to days in aerosols and on surfaces.” That includes paper money and coins, according to Dr. Sanjay Maggirwar, chair of the George Washington University School of Medicine’s department of microbiology, immunology and tropical medicine. “Certainly with the coronavirus, cash handling is a concern,” he told CBS MoneyWatch.

As with restrictions on research, this practice is entirely unnecessary and could easily be remedied with swift legislative action on the part of Congress.


U.S. prisons are poised to become hotbeds for COVID-19. Overcrowding, poor nutrition, toxic stress, and an aging prison population put incarcerated individuals at exceptionally high risk. Moreover, as the BBC notes: “Handcuffed people cannot cover their mouths when they cough or sneeze, sinks [in prisons and jails] often lack soap, and hand sanitizer is considered contraband due to its alcohol content.”

The war on drugs is a major cause of overcrowded U.S. prisons, which have been condemned by international human rights organizations. A 2016 report from the Brennan Center for Justice concluded that nearly 40 percent of imprisoned Americans are behind bars with no compelling public safety reason.

The Last Prisoner Project estimates that 40,000 nonviolent cannabis convicts are sequestered in state and federal penal institutions, and they’re doing time because of something that is no longer illegal in many states. The group is advocating for the swift release of all cannabis prisoners and any inmates who are over 65 or who have an underlying health condition.

“Prison health is public health by definition,” says The Lancet. “With an estimated 30 million people released from custody each year globally, prisons are a vector for community transmission that will disproportionately impact marginalized communities.”

Proponents of criminal justice reform maintain that reducing prison populations should be an immediate priority if we are to slow the spread of a highly infectious disease, which, unlike the prisoners themselves, can’t be contained within prison walls.

Martin A. Lee is the Director of Project CBD and author of Smoke Signals: A Social History of Marijuana—Medical, Recreational and Scientific. Tiffany Devitt is President of Care By Design, a Division of CannaCraft.


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Aug 29, 2021

Thoughtful blog, thanks for sharing.

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