There is a heightened level of interest on the impact of marijuana usage in the oral cavity given the number of states that have legalized the drug for medical and recreational uses. Twenty-six states and the District of Columbia currently have laws legalizing marijuana in some form. Several other states will soon join them. At the present time, the body of research on the effects of cannabis on the oral cavity and periodontitis in particular is very limited. A recent JADA article (J Am Dent ...