Science Says: Lungs Love Weed

A twenty-year study examining marijuana’s effect on lungs suggests it’s healthier than tobacco.

January 11, 2012

Moderate marijuana users actually improved their lung function compared to non-smokers and cigarette smokers in the long term study. (Photo: Getty Images)

Breathe easy, tokers. Smoking marijuana in moderate amounts may not be so bad for your lungs, after all.

A new study, published in this month's Journal of the American Medical Association, tested the lung function of over 5,000 young adults between 18 and 30 to determine marijuana's effect on lungs. After 20 years of testing, researchers found some buzzworthy results: regular marijuana smokers (defined by up to a joint a day for seven years) had no discernable impairment in lung activity from non-smokers. 

In fact, researchers were surprised to find marijuana smokers performed slightly better than both smokers and non-smokers on the lung performance test. Why? The most likely explanation seems to be that the act of inhaling marijuana—holding each puff in for as long as possible—is a lot like a pulmonary function test, giving marijuana smokers an edge over their cigarette smoking counterparts.

MORE: 5 Reasons Not to Smoke Synthetic Weed

For most of human existence, cannabis has been considered a medicine. Queen Victoria used it to alleviate her menstrual cramps. Extracts were prescribed by doctors and available at every pharmacy in the U.S. According to Fast Food Nation author Eric Schlosser, attitudes toward cannabis only shifted when Americans began to notice and object to its use by immigrants around the turn of the 20th century. Said Schlosser in a PBS interview:

"What's interesting is if you look at origins of the marijuana prohibition in this country, it coincides with a rise in anti-immigrant sentiment. . . really since the early years of this century, the war on marijuana has been much more a war on the sort of people who smoke it, be they Mexicans or blacks or jazz musicians or beatniks or hippies or hip-hop artists. It's really been a war on nonconformists and the laws against marijuana have been used as a way of reasserting what are seen as traditional American values."

Attitudes are changing, however. Sixteen states now offer medicinal weed legally for patients, and the number is growing. More students are now smoking marijuana than binge drinking or smoking cigarettes. Weed-friendly communities like Oaksterdam, unthinkable a decade or two ago, are sprouting up and campaigning to have marijuana revenue regulated and taxed like alcohol.

As marijuana enters the mainstream, studies like the one published in JAMA might dispel false assertions about the plant's deleterious health hazards and promote its medicinal benefits. According to Dr. Donald P. Tashkin, a marijuana researcher at UCLA medical school, THC is known to have anti-inflammatory properties, which may prevent lung irritation from developing into the chronic obstructive pulmonary disease (COPD) that frequently devastates the lungs of tobacco smokers. Since inhaling the unfiltered smoke of a combusted marijuana plant isn't exactly the best delivery system for this panacea, he suggests that those who want to unlock its chemical potential find lower impact ways to get high.

"The smoke in marijuana contains thousands of ingredients, many of which are toxic and noxious and have the potential, at least, to cause airway injury," said Tashkin in TIME. "In an ideal world, it would be preferable to take it in another form." Volcano, anyone?

Comments 5

it took you twenty fucking years!! iv'e known that and im 14 and its illegal cause of oil, cloth, paper, and more companies that will be their competition

For me the issue is not whether pot is good for you - it's who has the right to decide what goes into my body. I am an adult US citizen. What right does big brother have to decide what I can or can't put in my own body? It always amazes me that the same people who scream life liberty and the pursuit of happiness are the same people who want everyone who touches pot to be put in jail.

Actually, Pot is illegal because of the beer companies and because of Montsanto. As was proven in the Netherlands, legalizing pot means a 25% drop in beer sales across the board. As a fiber, pot is much stronger and lasts decades longer then Monsanto's man made, chemical laden fabrics. The US Government, which had just done away with prohibition needed a new bad guy for all the cops it hired; was more then happy to take money from both Monsanto beer companies to make pot illegal. Seeing studies be ignored by or Government is nothing new. They ignored a 93 Harvard study that showed breast cancer is caused by bras. Our Government would rather kill is mothers and daughters and make a buck, then help ANYONE! There is a special place in Hell for them.

Yea, actually the whole body and planet loves weed. Cannabis Hemp is the same plant as Industrial Hemp, but C.H is the female of the species. It is her and her seeds that nurtured and fed most of the life of this planet, waiting for us as we crawled out of the primordial ooze we loved so long ago. She provided fuel for many religious beliefs common today and has been found in Egyptian tombs as a token worthy of the afterlife, kept us balanced with essential oils; Holly oil is rumored to have been Hemp oil. Those oils kept our skin young and supple long into the afterlife. too. All species on the planet evolved to carry a THC producing neuron in their brains (AKA CPU's). Our body's need that balance for survival; we are wired to accept her. Industrial Hemp did the work of the species. He clothed and sheltered humanity, body and soul as soon as we learned common decency and modesty. Having none of the medicinal internal healing characteristics of his "woman", he sheltered humanity when it got cold. It produced a sustainable clean burning heat producing nightlight to ward of the demons of time. It once fueled the gears and the automobility of the developing civilization as we rolled into the industrial age; Henry Fords first attempts at powered mobility were propelled by Hemp. As yourselves, you "great" people south of Canada... Why the is it illegal and hunted down to be destroyed?

OOPS, MARIJUANA MAY PREVENT CANCER (PART 1): Federal researchers implanted several types of cancer, including leukemia and lung cancers, in mice, then treated them with cannabinoids (unique, active components found in marijuana). THC and other cannabinoids shrank tumors and increased the mice's lifespans. Munson, AE et al. Antineoplastic Activity of Cannabinoids. Journal of the National Cancer Institute. Sept. 1975. p. 597-602. OOPS, MARIJUANA MAY PREVENT CANCER, (PART 2): In a 1994 study the government tried to suppress, federal researchers gave mice and rats massive doses of THC, looking for cancers or other signs of toxicity. The rodents given THC lived longer and had fewer cancers, "in a dose-dependent manner" (i.e. the more THC they got, the fewer tumors). NTP Technical Report On The Toxicology And Carcinogenesis Studies Of 1-Trans- Delta-9-Tetrahydrocannabinol, CAS No. 1972-08-3, In F344/N Rats And B6C3F Mice, Gavage Studies. See also, "Medical Marijuana: Unpublished Federal Study Found THC-Treated Rats Lived Longer, Had Less Cancer," AIDS Treatment News no. 263, Jan. 17, 1997. OOPS, MARIJUANA MAY PREVENT CANCER (PART 3): Researchers at the Kaiser-Permanente HMO, funded by NIDA, followed 65,000 patients for nearly a decade, comparing cancer rates among non-smokers, tobacco smokers, and marijuana smokers. Tobacco smokers had massively higher rates of lung cancer and other cancers. Marijuana smokers who didn't also use tobacco had no increase in risk of tobacco-related cancers or of cancer risk overall. In fact their rates of lung and most other cancers were slightly lower than non-smokers, though the difference did not reach statistical significance. Sidney, S. et al. Marijuana Use and Cancer Incidence (California, United States). Cancer Causes and Control. Vol. 8. Sept. 1997, p. 722-728. OOPS, MARIJUANA MAY PREVENT CANCER (PART 4): Donald Tashkin, a UCLA researcher whose work is funded by NIDA, did a case-control study comparing 1,200 patients with lung, head and neck cancers to a matched group with no cancer. Even the heaviest marijuana smokers had no increased risk of cancer, and had somewhat lower cancer risk than non-smokers (tobacco smokers had a 20-fold increased Lung Cancer risk). Tashkin D. Marijuana Use and Lung Cancer: Results of a Case-Control Study. American Thoracic Society International Conference. May 23, 2006. OOPS, MARIJUANA DOES HAVE GREAT MEDICAL VALUE: In response to passage of California's medical marijuana law, the White House had the Institute of Medicine (IOM) review the data on marijuana's medical benefits and risks. The IOM concluded, "Nausea, appetite loss, pain and anxiety are all afflictions of wasting, and all can be mitigated by marijuana." The report also added, "we acknowledge that there is no clear alternative for people suffering from chronic conditions that might be relieved by smoking marijuana, such as pain or AIDS wasting." The government's refusal to acknowledge this finding caused co-author John A. Benson to tell the New York Times that the government "loves to ignore our report … they would rather it never happened." Joy, JE, Watson, SJ, and Benson, JA. Marijuana and Medicine: Assessing the Science Base. National Academy Press. 1999. p. 159. See also, Harris, G. FDA Dismisses Medical Benefit From Marijuana. New York Times. Apr. 21, 2006