In 1972 and 1973, 1037 children in New Zealand were chosen to participate in long-term studies of the effects of lifestyle behavior on physical health. One of those studies1 looked into the effect of cannabis and tobacco use on the health of these participants in the age period 18 to 38 years old. The results of this study were published this June.

Measurements were made of periodontal health, lung function, systemic inflammation and metabolic health, along with self-reporting, when participants were at ages 26 and 38 years.

The study also looked at tobacco use in the same group. As expected, tobacco use was associated with impaired lung function, systemic inflammation and metabolic health.

None of these effects was associated with cannabis use. The only health issue correlated with 20-year persistent use of cannabis was an increase in periodontal disease.

Another good reason to floss.

1JAMA Psychiatry. 2016 Jun 1. doi: 10.1001/jamapsychiatry.2016.0637. [Epub ahead of print]