Smoking marijuana, even occasionally, can increase your risk for more severe complications from Covid-19, the disease caused by the novel coronavirus.
“What happens to your airways when you smoke cannabis is that it causes some degree of inflammation, very similar to bronchitis, very similar to the type of inflammation that cigarette smoking can cause,” said pulmonologist Dr. Albert Rizzo, chief medical officer for the American Lung Association. “Now you have some airway inflammation and you get an infection on top of it. So, yes, your chance of getting more complications is there.”
Hey wait, you might say, I’ve only just started and I’m not smoking much — so what’s the harm?
The problem, said Dr. Mitchell Glass, a pulmonologist and spokesperson for the American Lung Association, is that the last thing you want during a pandemic is to make it more difficult for a doctor to diagnose your symptoms.
“Covid-19 is a pulmonary disease,” Glass said. “Do you really want to have a confounding variable if you need to see a doctor or a healthcare worker by saying, ‘Oh, and by the way, I’m not a regular user of cannabis, but I decided to use cannabis to calm myself down.’
“You don’t want to do anything that’s going to confound the ability of healthcare workers to make a rapid, accurate assessment of what’s going on with you,” he added.
Is that cough from smoking or coronavirus?
“Chronic” marijuana smoking, defined as daily use, damages the lungs over a period of time. The end result “looks a lot like chronic bronchitis, which is of course one of the terms we use for chronic obstructive lung disease, or COPD,” Glass said.
Smokers, people with COPD and other chronic lung diseases, as well as people with moderate to severe asthma are among those at high risk for severe illness from Covid-19, including the worst-case scenario of being placed on a ventilator in order to continue breathing.
Signs of lung damage from smoking even just a few cigarettes can show up in a matter of days. While a hit or two of marijuana doesn’t compare, there are some unique properties to a joint of weed that are definitely problematic for the lungs even if you’re a new smoker, Glass said.
Think of what happens to a cigarette when lit and left in an ashtray — it will burn quickly all the way down to the filter, with nothing left but ash.
“It’s surrounded by paper. It’s completely dried out. It is made to burn at a very high temperature,” Glass said.
Now think of how a joint burns — there’s always some weed left, the “roach,” as it is called.
“Marijuana burns at a much, much lower temperature than a commercially made cigarette,” said Glass. “Because of that, the person is inhaling a certain amount of unburnt plant material.”
That irritates the lungs in the same manner as ragweed, birch and oak pollen does for those allergic to them, he said.
“So right off the bat there are those patients who would be increasingly susceptible to having a bronchospasm or cough because they have a more sensitive airway.”
And since a dry cough is a key sign of Covid-19, any cough caused by smoking a joint of weed could easily mimic that symptom, making diagnosis more difficult.
The need for a clear head
There’s another factor as well. As we all know, weed not only calms you down, but it messes with your ability to function — and that does you no favors if you find yourself having a medical emergency during a pandemic.
“You’re reducing anxiety, but that is still a change in your thinking, a change in the way you are handling facts, how you’re grasping situations,” Glass said.
If you’re not a regular smoker of marijuana, don’t start, experts say.
Remember the bottom line when it comes to smoking and Covid-19, Rizzo said.
“It’s common sense that anything you inhale that has been combusted and contains particles or chemicals can inflame your airways,” he said. “So you’re already making your body fight off foreign particles before it even has to fight off the infection.”
Will you stop smoking during lockdown?