Researchers at the Departments of Community Health, Pathology and Laboratory Medicine, Brown University, Providence, RI, USA, have found that Cannabinoids, constituents of marijuana smoke, have been recognized to have potential antitumor properties. They wrote, “However, for the subjects who have the same level of smoking or alcohol drinking, we observed attenuated risk of HNSCC (head and neck squamous cell carcinoma ) among those who use marijuana compared with those who do not. Our study suggests that moderate marijuana use is associated with reduced risk.