The long-term health effects of marijuana use revealed in new study

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Adding to the growing literature concerning the long-term effects of marijuana, a new study that monitored 1,037 New Zealand residents for 38 years has determined the only negative physical health consequence to really watch out for isbad gums and damage to the bone that supports the teeth.

For the study, scientists used "laboratory measures of physical health" and also had the participants self-report their own health. The scientists also factored in socioeconomic status, childhood health and if the participant used tobacco.

So while cannabis users had poor periodontal health, they also had lower body mass indexes, smaller waists and better high-density lipoprotein, or HDL, the good cholesterol. These results have led researchers to think that cannabis may have an impact on metabolism.

RELATED: Marijuana laws by state:

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Marijuana laws by state
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The long-term health effects of marijuana use revealed in new study

Alabama

No legalization of any kind

(Photo: Dennis Macdonald via Getty Images)

Alaska

Marijuana legalized for medical and recreational use 

(Photo: Zoonar/N.Okhitin via Getty Images)

Arizona

Marijuana legalized for medical use

(photo: TaylorB90/Flickr)

Arkansas

No legalization of any kind 

(photo: yorkfoto)

California

Marijuana legalized for medical use

(Photo: Dorling Kindersley via Getty Images)

Colorado

Marijuana legalized for medical and recreational use  

(Photo: Shutterstock)

Connecticut

Marijuana legalized for medical use 

(photo: Shutterstock)

Delaware

Marijuana legalized for medical use 

(photo: Shutterstock)

Florida

No legalization of any kind

(photo: Shutterstock)

Georgia

No legalization of any kind

(photo: Shutterstock)

Hawaii

Marijuana legalized for medical use

(Photo: Shutterstock)

Idaho

No legalization of any kind

(photo: Shutterstock)

Illinois

Marijuana legalized for medical use

(Photo: VisionsofAmerica/Joe Sohm)

Indiana

No legalization of any kind

(Photo: Shutterstock)

Iowa

No legalization of any kind

(photo: yorkfoto)

Kansas

No legalization of any kind

(photo: Shutterstock)

Kentucky

No legalization of any kind

(Photo: Dorling Kindersley via Getty Images)

Louisiana

No legalization of any kind

(Photo: Shutterstock)

Maine

Marijuana legalized for medical use

(photo: Shutterstock)

Maryland

Marijuana legalized for medical use

(Photo: Shutterstock)

Massachusetts

Marijuana legalized for medical use

(photo: Shutterstock)

Michigan

Marijuana legalized for medical use

(photo: Shutterstock)

Minnesota

Marijuana legalized for medical use

(photo: anthonylibrarian/Flickr)

Mississippi

No legalization of any kind

(Photo: Medioimages/Photodisc via Getty Images)

Missouri

No legalization of any kind 

(Photo: Shutterstock)

Montana

Marijuana legalized for medical use

(photo: J.Stephen Conn/Flickr)

Nebraska

No legalization of any kind 

(photo: Shutterstock)

Nevada

Marijuana legalized for medical use

(photo: Shutterstock)

New Hampshire

Marijuana legalized for medical use

(photo: Shutterstock)

New Jersey

Marijuana legalized for medical use 

(Photo: Shutterstock)

New Mexico

Marijuana legalized for medical use 

(photo: Shutterstock)

New York

Marijuana legalized for medical use

(photo: Shutterstock)

North Carolina

No legalization of any kind

(photo: Getty Images)

North Dakota

No legalization of any kind

(Photo: Shutterstock)

Ohio

No legalization of any kind

(photo: Shutterstock)

Oklahoma

No legalization of any kind

(photo: Shutterstock)

Oregon

Marijuana legalized for medical and recreational use  

(Photo: Shutterstock)

Pennsylvania

No legalization of any kind

(photo: Henryk Sadura)

Rhode Island 

Marijuana legalized for medical use

(Photo: Shutterstock)

South Carolina

No legalization of any kind

(Photo: Shutterstock)

South Dakota

No legalization of any kind

(Photo: Norman B. Leventhal Map Center at the BPL/Flickr)

Tennessee

No legalization of any kind

(photo: Shutterstock)

Texas

No legalization of any kind

(Photo: Shutterstock)

Utah

No legalization of any kind 

(Photo: Shutterstock)

Vermont

Marijuana legalized for medical use

(photo: Shutterstock)

Virginia

No legalization of any kind

(photo: Shutterstock)

Washington

Marijuana legalized for medical and recreational use 

(photo: Shutterstock)

West Virginia 

No legalization of any kind

(Photo: dk_photos via Getty Images )

Wisconsin

No legalization of any kind 

(photo: Kubrak78)

Wyoming

No legalization of any kind

(Photo: Space Images via Getty Images)

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On the other hand, tobacco users had worse metabolisms, along with poorer lungs and more inflammation than their fellow participants. Scientists theorize that that's due to tobacco smokers burning through several packs a day while marijuana smokers may smoke only a few joints a day.

A study that looked at only 15 years of pot smokers' lives found that there was no increased mortality rate in comparison to non-smokers.

"The answers with marijuana aren't exactly what we would have expected them to be, and this is a great example," Dr. Kevin Hill, an assistant professor of psychiatry at Harvard Medical School who commented on the study for JAMA Psychiatry, said, according to Time. "You need to be willing to change your mind on these issues."

Read more: Here's How Smoking Weed Will Affect Your Sleep
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