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Curr Oncol. 2018 Jun;25(3):219-225. doi: 10.3747/co.25.3983. Epub 2018 Jun 28.

Rates of cannabis use in patients with cancer.

Author information

1
Department of Oncology, Tom Baker Cancer Centre, University of Calgary, Calgary.
2
Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton.
3
Department of Oncology, Central Alberta Cancer Centre, University of Calgary, Calgary; and.
4
Department of Oncology, Jack Ady Cancer Centre, University of Calgary, Calgary, AB.

Abstract

Background:

A comprehensive assessment of cannabis use by patients with cancer has not previously been reported. In this study, we aimed to characterize patient perspectives about cannabis and its use.

Methods:

An anonymous survey about cannabis use was offered to patients 18 years of age and older attending 2 comprehensive and 2 community cancer centres, comprising an entire provincial health care jurisdiction in Canada (ethics id: hreba-17011).

Results:

Of 3138 surveys distributed, 2040 surveys were returned (65%), with 1987 being sufficiently complete for analysis (response rate: 63%). Of the respondents, 812 (41%) were less than 60 years of age; 45% identified as male, and 55% as female; and 44% had completed college or higher education.Of respondents overall, 43% reported any lifetime cannabis use. That finding was independent of age, sex, education level, and cancer histology. Cannabis was acquired through friends (80%), regulated medical dispensaries (10%), and other means (6%). Of patients with any use, 81% had used dried leaves.Of the 356 patients who reported cannabis use within the 6 months preceding the survey (18% of respondents with sufficiently complete surveys), 36% were new users. Their reasons for use included cancer-related pain (46%), nausea (34%), other cancer symptoms (31%), and non-cancer-related reasons (56%).

Conclusions:

The survey demonstrated that prior cannabis use was widespread among patients with cancer (43%). One in eight respondents identified at least 1 cancer-related symptom for which they were using cannabis.

KEYWORDS:

Cannabis; marijuana; symptoms

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