Long-term use of cannabis is associated with a significant increase in the risk of developing gum disease but does not appear to be linked to adverse outcomes on other measures of heath, new data suggest.Although they don't come out and say it causes periodontitis... they do say it is a long term complication.
Madeline H. Meier, PhD, Department of Psychology, Arizona State University, Tempe, and colleagues found that regular use of cannabis during adulthood was associated with periodontal disease at age 38 years.
However, unlike long-term tobacco use, cannabis was not linked to significant or relevant changes in measures of lung function, systemic inflammation, cardiovascular function, and metabolic health.
It seems more logical to me that people with chronic periodontitis are just more likely to put PAIN REDUCING substances in their mouths. Like cannabis.
Or Cigarettes . or Alcohol. or Hot Sauce. or Mint. or Chocolate. or Gluten. or SUGAR.
Cannabis is the only one that actually makes the mouth tissues heal better though.