Now that marijuana is legal for medical or recreational use in many states, growing numbers of Americans — including older people — are imbibing this popular drug. In fact, the percentage of people ages 65 and older who said they used some form of marijuana almost doubled between 2015 and 2018, a recent study reports.
Compared with prescription drugs, the health consequences of using marijuana are not nearly as well studied. But converging evidence suggests that the drug may be harmful for the heart, according to a review article in JACC: Journal of the American College of Cardiology. More than two million Americans with heart disease currently use or have used marijuana, the authors estimate.
Puffing pot vs. cigarettes
Derived from Cannabis sativa or Cannabis indica plants, marijuana is most often smoked in joints or in a pipe. People also vape the drug in electronic cigarettes (e-cigarettes), or consume it in foods or candy (called edibles) or as a tincture. Many people assume that smoking or vaping marijuana isn’t as dangerous as smoking cigarettes, says study co-author Dr. Muthiah Vaduganathan, a cardiologist at Harvard-affiliated Brigham and Women’s Hospital.
“But when people smoke tobacco, they take frequent, small puffs. In contrast, smoking marijuana usually involves large puffs with longer breath holds,” he says. So smoking marijuana may deposit as much or more of the chemical toxins into the lungs as when people smoke cigarettes, he adds. And vaping any substance can be dangerous; thousands of people in the United States have suffered serious lung injuries using e-cigarettes. As of this writing, 64 of them have died.
Marijuana can cause the heart to beat faster and blood pressure to rise, which can be dangerous for people with heart disease. The risk of heart attack is several times higher in the hour after smoking marijuana than it would be normally, research suggests. Other studies have fou