Study: A Joint May Be Easier On Lungs Than A Cigarette | WAMU 88.5 - American University Radio

NPR : News

Filed Under:

Study: A Joint May Be Easier On Lungs Than A Cigarette

Smoking marijuana has just got to be bad for the lungs, since it's been made abundantly clear that cigarettes wreak havoc. Or so it would seem.

But the record on marijuana and lung health has been confusing at best. The latest study is typical: It shows that pot smokers' lung function actually improves, at least if they're not smoking a lot.

Smoking a joint a week for up to seven years doesn't hurt lung function, according to researchers at the University of California, San Francisco. They came up with that number after following more than 5,000 people for 20 years. The results were just published in JAMA, the Journal of the American Medical Association.

In fact, those occasional pot smokers actually had improvements in some measurements of lung function. That may be due in part to the stretching involved in the deep tokes typical of marijuana use. By contrast, both past and present cigarette smokers had impaired lung function.

But the pot smokers didn't get a completely clean bill of health. Heavy marijuana users, which the study defined as smoking more than 20 times a month, did see a decline in lung capacity. But that's after exposure to more than 10 "joint-years," which the scientists calculated as a joint a day for a decade. That's a fair amount of weed.

Cigarette use and marijuana use was self-reported, leading some Shots contributors to wonder just how how reliable those pothead reminiscences could be. Indeed, the scientists said that previous studies have shown that people's recollection of cigarettes smoked generally squares with nicotine levels in the blood. But they didn't test pot smokers' blood to see if that was true for them, too.

The lack of ill effect for occasional pot smokers may be good news for people considering marijuana for pain control or other medical purposes, the researchers conclude. But "our findings do suggest an accelerated decline in pulmonary function with heavy use," the scientists wrote, "and a resulting need for caution and moderation."

Copyright 2012 National Public Radio. To see more, visit http://www.npr.org/.

NPR

How'd A Cartoonist Sell His First Drawing? It Only Took 610 Tries

Tom Toro was a directionless 20-something film school dropout. Then, after an inspired moment at a used book sale, he started submitting drawings to The New Yorker ... and collecting rejection slips.
NPR

Will Environmentalists Fall For Faux Fish Made From Plants?

A handful of chefs and food companies are experimenting with fish-like alternatives to seafood. But the market is still a few steps behind plant-based products for meat and dairy.
WAMU 88.5

Plan To Offer Free Community College Divides Along Party Lines

In his State of the Union address, President Barack Obama laid out a plan to offer two years of community college. But at least in Northern Virginia, support for the proposal seems split on partisan lines.

NPR

Sling TV Could Be Cable-Cutter's Dream

Sling TV launches in a few weeks. That's the new streaming service from Dish that allows viewers to stream content previously only available through cable.

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.