Cannabis use and patient-reported outcomes among patients at a comprehensive cancer center

Patients with cancer report increasing rates of cannabis use, often to manage symptoms and toxicities. The efficacy and safety of cannabis, however, for some use cases remains unclear. To better understand characteristics of patients with cancer who report using cannabis, we examined data from a cannabis use survey of among patients with cancer seen at a National Cancer Institute–Designated Cancer Center.

In late 2021, patients with cancer (N = 1608) treated between July 2017 and December 2019 provided cannabis use data. Additional data were obtained from medical records data and routine patient-reported outcomes collected for clinical purposes. Univariable analyses and multivariable regression analyses were conducted to identify correlates of cannabis use at different stages in the cancer care trajectory.

Rates of self-reported cannabis use by patients with cancer were 59% before cancer diagnosis and 47% after diagnosis. Longitudinal rates of cannabis use were 29% for no cannabis use, 23% before diagnosis, 12% after diagnosis, and 35% for both before and after diagnosis. Demographic factors associated with cannabis use included age, sex, race, and educational achievement. Tobacco use and binge drinking were associated with higher odds of cannabis use. Cannabis use was also associated with greater self-reported interference with physical functioning due to pain and interference with social functioning due to health problems.

We found high rates of cannabis use among patients with cancer, both before and after their cancer diagnosis. Future studies should further investigate psychosocial factors associated with cannabis use among patients with cancer as well as psychosocial outcomes among patients with cancer using cannabis.