VIDEO: Study released by AMA shows marijuana does not decrease pulmonary function

A study released today by the Journal of the American Medical Association found that people who smoke marijuana once a week or so do not suffer from reduced pulmonary function and may actually see improvements in their pulmonary function.

The study by researchers at the University of Alabama at Birmingham and the University of California, San Francisco was released today by the Journal of the American Medical Association.

In the following video, Dr. Stefan Kertesz, MD, of the University of Alabama Medical School, said researchers studied 5000 adults over a period of 20 years beginning in the 1980s.

He defined marijuana use by “joint years”, with one joint year comprised of smoking one joint a day for a year. He says that up to about seven joint years, users tend to see improved lung function but that improvement flattens out after seven joint years and lung function then decreases in some cases.

At very high levels of usage, he said the study indicates there could be harm to pulmonary function but that no harm was seen among moderate users.

Scot Kersgaard has been managing editor of a political newspaper, editor and co-owner of a ski town newspaper, executive editor of eight high-tech magazines (where he worked with current Apple CEO Tim Cook), deputy press secretary to a U.S. Senator, and an outdoors columnist at the Rocky Mountain News. He has an English degree from the University of Washington. He was awarded a fellowship to study internet journalism at the University of Maryland's Knight Center for Specialized Journalism. He was student body president in college. He spends his free time hiking and skiing.