A new study published in JAMA Otolaryngology-Head & Neck Surgery found a link between cannabis use disorder and increased risk of head and neck cancers. The research analyzed 20 years of medical data from over 116,000 U.S. adults with CUD and compared them to a control group without the disorder. Results showed that individuals with CUD were 3.5 to five times more likely to develop head and neck cancers. While the study did not investigate how patients used cannabis, it suggests that heavy and regular use may be a risk factor for these cancers.

Source: https://www.livescience.com/health/marijuana/cannabis-use-linked-to-head-and-neck-cancer-risk