The scientific literature can sometimes provide conflicting data on causal relationships. This study performed a systematic review with meta analysis. Ultimately 9 case-control studies in 6 articles were selected and reviewed with software.
This study evaluated the chance of developing head and neck cancer for individuals who had smoked marijuana in their lifetime in models controlled for age, gender, race, and tobacco consumption.
Approximately 12% of head and neck cancer patients in these cases were marijuana users, while approximately 14% of the healthy controls were marijuana users.
No association between lifetime marijuana use and the development of head and neck cancer was found.
