Marijuana use for as long as 20 years has been linked with gum disease, specifically at age 38, according to a study in JAMA Psychiatry.
Of the 1,037 participants, 484 reported using tobacco daily at some point in their lives while 675 reported using cannabis in any amount at any point. Researchers asked each participant how often they used cannabis at ages 18, 21, 26, 32, and 38.
They also obtained laboratory measures of physical health, including periodontal health, lung function, inflammation, and metabolic health. At ages 26 and 38, the participants themselves also weighed in on how they felt physically.
The findings revealed cannabis could not be linked to physical health problems other than poorer periodontal health at age 38. The researchers suspect cannabis users may be brushing and flossing less than others and more likely to be dependent on alcohol.