Cannabis For Cold & Flu: Can Weed Help Fight The Common Cold?
As research has started to show, cannabis produces a variety of cannabinoids and other compounds with therapeutic potential. But are they able to help alleviate cold and flu symptoms? We can’t say for certain, but the current studies out there look promising.
The common cold and flu can spread through an office or campus like wildfire. Sit next to the wrong person, and you could find yourself coming down with something the next day. Sure, minor colds might give you a stuffy nose for a few days. At the same time, if you get a bad case of the flu, it can knock you down for a couple of weeks.
Now, most people reach for acetaminophen and copious amounts of tea when feeling under the weather. Those are all great, but there might be other (read: more fun) options to help take the edge off. What’s better, those options come in the form of delightful cannabis buds.
WHAT CAUSES THE COMMON COLD?
Over 200 different viruses can cause symptoms of the common cold. Sure, old wives tales blame chilly weather as the culprit, but the condition could actually be underpinned by hundreds of different microbes.
People come down with symptoms of the common cold after breathing in viral particles. These pathogens usually enter your lungs after you’ve been near someone coughing, sneezing, or simply breathing. You’re also vulnerable if you touch a contaminated surface and wipe your mouth/pick your nose without washing your hands.
The common cold can strike at any time, but infection rates increase dramatically during autumn and winter. The lack of humidity during these months causes the nasal passages to become dry, contributing to infection. The start of the academic year also means there are more people in close proximity, which helps cold viruses spread.
Several risk factors also increase a person’s chances of catching a cold. These include:
• Being young or old: The youngest and oldest people are most at-risk for serious cases
• Having a compromised immune system
• Being a frequent smoker
HOW COMMON COLDS AFFECT THE BODY
Colds viruses, right off the bat, cause upper respiratory infections. When viral particles first enter the airways, your immune system rises to the occasion.
White blood cells will first differentiate between foreign pathogens and the body’s own cells. Once they identify the enemy, these white blood cells—including leukocytes and natural killer cells—being to wage war.
Soon after, the adaptive immune system kicks in. White blood cells manufacture antibodies specifically designed to combat the new pathogen. These proteins mean the body can defend itself against future infections by the same pathogen.
You’ll experience many physical symptoms during this microscopic war. These usually include:
• Stuffy nose
• Low-grade fever
Most people recover before anything else happens. It doesn’t fade as easily for everyone, though. Symptoms of an advanced cold include:
• Ear infection
• Strep throat
• Chest infection
CAN CANNABIS HELP RELIEVE COMMON COLD SYMPTOMS?
No cure exists for the cold. You simply need to endure it until the body defeats the pathogen. However, conventional approaches like painkillers and decongestants are designed to reduce symptoms. Alternative treatments such as zinc, vitamin C, and other herbal remedies also appear to help.
Cannabis, as it turns out, might belong in the latter category. Humans have used the herb to address many different ailments for thousands of years. Sceptical of ancient practices, though? Modern scientific analysis has also shown that many of the phytochemicals in cannabis possess therapeutic potential.
That being said, little to no evidence exists that cannabis can alleviate the common cold. No human trials have demonstrated if the herb helps or hurts the body as it works to kill the virus. However, certain chemicals within the plant show the potential to help tackle some of the symptoms.
All of the symptoms of the common cold stem from inflammation  . Your immune system—not the pathogen—underpins symptoms such as a sore throat and runny nose. The body instigates an inflammatory response for a key reason: to allow white blood cells easier passage through the tissues to reach the site of infection.
Although inflammation serves a purpose, it can lead to uncomfortable sensations. Hence, anti-inflammatory drugs such as NSAIDs are often advised to reduce cold symptoms. As it happens, cannabis also produces molecules with anti-inflammatory potential.
Research published in the European Journal of Pharmacology  in 2019 tested the effects of CBD on airway inflammation in mice with asthma. After administering CBD, they found the cannabinoid to not only decrease inflammation symptoms, but to improve their airway remodelling processes. CBD was believed to exert these immunomodulatory effects via signalling of CB1 and CB2 receptors.
Previous research published in 2015  found CBD to improve lung function and inflammation in mice. Additional research published in Immunopharmacology  examined the effects of THC and CBD on cytokine production in human immune cells. Cytokines are signalling molecules used to drive inflammatory responses. Fortunately, both THC and CBD were observed to strongly inhibit cytokine production.
Along with inflammation, CBD may help to reduce cold and flu-related pain. For example, a 2007 study  found CBD to act as an orally effective therapeutic agent for chronic inflammatory and neuropathic pain in mice.
However, it might work better for pain when taken alongside THC. Researchers found that CBD enhanced  and prolonged THC’s pain-reducing effects when the two cannabinoids were given to mice in combination.
Neither of these studies say anything about how these treatments will work for humans. Considering that, though, they’re promising starting points for future research.
Lack of sleep seriously disturbs immune function. In fact, people who are sleep deprived are more likely to get sick  after being exposed to a common cold virus. In turn, getting a good amount of sleep while sick can also change how fast your body recovers.
Adding another potential benefit to the checklist, studies suggest that CBD may help people fall asleep  and stay asleep. Researchers believe these effects are partly caused by a reduction in anxiety that otherwise keeps people awake.
THC may also help to decrease the amount of time  it takes to fall asleep. However, heavy and long-term use appears to actually decrease sleep quality  by reducing REM sleep.
Many cannabis strains also produce high levels of the terpene myrcene. The molecule displays soporific effects, with research  showing it to enhance muscle relaxation and increase sleep time in mice.
DOES SMOKING CANNABIS MAKE A COLD OR FLU WORSE?
So far, we’ve been making a good case for cannabinoids. The act of smoking, however, is another issue.
Of course, letting carcinogenic compounds into your airways when you have a respiratory illness won’t do your body any favours. No evidence suggests that doing so will make your condition worse, but it makes sense to avoid it. Harsh smoke might exacerbate an already sore and dry throat, ultimately making those symptoms worse.
WHAT’S THE BEST WAY TO USE CANNABIS FOR THE COMMON COLD?
Thankfully, you can consume cannabis in many different ways. Even better, most of them don’t involve passing hot smoke down your sore, cold-ridden throat.
MAKE YOUR OWN CANNABIS TEA
A warm cup of tea does wonders to lift the spirits when you’re cold-stricken. In turn, adding a touch of cannabis to the mix might be just what you need to ease your symptoms. Cannabis tea allows users to avoid inhaling anything, and it produces more intense effects than smoking. Use our simple recipe to brew up a batch next time you start feeling a cold coming on.
The common cold often causes fatigue and aching muscles. It just so happens that topical CBD can potentially help stave off these issues. Since you’re applying it directly to the skin as a gel, lotion, or balm, it’s able to more directly target the source of the issue.
Edibles allow users to bypass smoking, sending cannabinoids directly through the GI tract and into the bloodstream. Edibles take longer to set in due to their extended metabolic pathway, but the effects are often much more pronounced. You can even make cannabutter at home to infuse your favourite dish with high levels of THC, CBD, or both.
Unlike smoking, vaping’s low temperatures preserve every cannabinoid in the bud or concentrate. By only heating a bit past the decarboxylation point, the cannabinoids and terpenes can be vaporized without burning plant matter. This lack of combustion makes inhaling cannabinoids much less harsh on the throat.
DOES CBD OIL HELP WITH THE COMMON COLD?
Well, we don’t have any evidence that CBD oil will help cure your cold. However, the studies we covered above suggest that the cannabinoid might help relieve some of the symptoms. High-quality, full-spectrum CBD oils also bring lots of synergistic cannabinoids and terpenes in tow, many of which could potentially offer further symptom relief.
SHOULD YOU USE CANNABIS IF YOU HAVE A COLD OR FLU?
The jury is still out. Really, it depends on the individual. The only way to truly know if it works for you is to give it a go. Carefully dose out your cannabinoids as your immune system gets to work, and pay attention to see if your symptoms begin to reduce.
Humans have used cannabis for holistic purposes for thousands of years, but could it possibly help with one of the most common health issues out there?
Is It Safe to Smoke Weed If You Have a Cold or the Flu?
The safety and long-term health effects of using e-cigarettes or other vaping products still aren’t well known. In September 2019, federal and state health authorities began investigating an outbreak of a severe lung disease associated with e-cigarettes and other vaping products . We’re closely monitoring the situation and will update our content as soon as more information is available.
There isn’t any evidence that smoking weed while you have a cough, cold, or the flu is inherently unsafe. But does it make sense?
If your throat and lungs are already irritated, smoking may exacerbate your discomfort. Smoking weed has short- and long-term effects on lung and respiratory function.
You may also find that your body responds differently to weed when you’re sick. Both smoking weed and common illnesses such as the flu can cause fatigue, chills, and headaches. You may feel these effects more intensely when you’re sick.
If you already smoke weed on a regular basis, doing so while you’re sick probably won’t have a drastic impact on your symptoms. Still, you should proceed with caution. This probably isn’t the time to experiment with new dosages and strains.
You should also keep in mind that you can spread your illness to others by sharing a joint, bowl, or bong.
Read on to learn more.
At this time, there isn’t any available research on smoking weed while sick with the cold or flu. Research exploring the use of weed for medicinal purposes is still extremely limited.
Although there may be benefits to smoking weed while sick, it’s unclear if they outweigh the potential negative effects.
According to a comprehensive 2017 review , there’s evidence that weed smoke has anti-inflammatory properties.
Inflammation plays a role in a number of cold and flu symptoms, including:
- sore throat
- swollen nasal passageways
Weed’s anti-inflammatory properties might help relieve some of these symptoms, but more research needs to be done to understand the exact benefits.
The same 2017 review concludes that weed is an effective treatment for chronic pain among adults.
Chronic pain is ongoing. It’s different than the acute aches and pains caused by a cold or the flu.
Still, it’s possible that smoking weed could help relieve pain associated with short-term illnesses such as a cold or the flu.
A 2017 review of research on cannabis and sleep indicates that weed’s active ingredient, delta-9-tetrahydrocannabinol (THC), may help sleep in the short term.
Given this, smoking weed might help you sleep, but when you’re sick with a cold or the flu your sleep cycle might already be altered.
However, long-term weed use is associated with tolerance to the drug’s sleep-inducing effects. In other words, if you’re a regular user, weed might not be as effective in helping you sleep.
Although there’s no serious risk, combining weed with OTC cold and flu medications that have sedative effects, such as NyQuil, can intensify drowsiness and affect cognitive function. You may find it more difficult to concentrate or make decisions.
Can smoking or ingesting marijuana while taking OTC medications for cold and flu result in any adverse effects?
Marijuana should be used with caution while taking OTC medications for cold and flu. Some OTC remedies alter how the body processes the psychoactive components of marijuana, which may lead to an accumulation of excess effects.
Additionally, many OTC options have dry mouth, sedation, confusion, blurry vision, heart rate alterations, and loss of balance as typical side effects in susceptible users; marijuana consumption may lead to worsening of these effects.
To avoid risk of adverse effect, wait to use marijuana (if an occasional or rare user) or do not increase your typical dose consumed (if a routine user) if you require OTC cold or flu medications.
Daniel Murrell, MD Answers represent the opinions of our medical experts. All content is strictly informational and should not be considered medical advice.
Remember, there hasn’t been any research on weed use while sick with a cough, cold, or flu. In addition, studies on the use of weed for medicinal purposes are limited.
There’s moderate evidence that smoking weed can lead to the following side effects, but this list may not be complete due to the lack of research.
According to a 2017 review , smoking weed in the long term is associated with a chronic cough and excess phlegm production.
If you’re sick with a cough, cold, or flu, smoking weed could make your respiratory symptoms worse. This is because weed smoke irritates the throat and airways.
Other routes of administration, such as vaping, generally don’t have the same effect on the respiratory system.
Dizziness is a common side effect of both inhaling and ingesting cannabis. Cannabis use can cause a sudden drop in blood pressure that may leave you feeling faint or light-headed.
If you already feel weak or dizzy while sick with a cough, cold, or flu, weed could make it worse.
If you’re a regular user, you may be able to minimize dizziness by decreasing your dosage.
Inhaling or ingesting cannabis activates cannabinoid receptors in the gastrointestinal system. This can cause a variety of effects, including stomach pain and inflammation.
Cannabinoid hyperemesis syndrome, a rare condition linked to long-term cannabis use, causes severe stomach pain, nausea, and vomiting.
Weed use could exacerbate stomach symptoms caused by a cold or the flu, especially if you tend to experience stomach pain when you use weed. You may be able to minimize these effects by decreasing your dosage.
There isn't any evidence that smoking weed while you have a cough, cold, or the flu is inherently unsafe. But if your throat is already irritated, smoking may feel uncomfortable. Your body may also respond differently to weed while you’re sick. Here's what you should know about toking, vaping, edibles, and more.