Background and Objectives
Over 12% of U.S. adults report past-year cannabis use, and
among those who use daily, 25% or more have a cannabis use disorder.
Use is increasing as legal access expands. Yet, cannabis use is not
routinely assessed in primary care, and little is known about use among
primary care patients and relevant demographic and behavioral health
subgroups. This study describes the prevalence and frequency of past-year
cannabis use among primary care patients assessed for use during a primary
care visit.
Methods
This observational cohort study included adults who made a visit to
primary care clinics with annual behavioral health screening, including a
single-item question about frequency past-year cannabis use (March
2015-February 2016; n=29,857). Depression, alcohol and other drug
use were also assessed by behavioral health screening. Screening results,
tobacco use, and diagnoses for past-year behavioral health conditions (e.g.,
mental health and substance use disorders) were obtained from EHRs.
Results
Among patients who completed the cannabis use question
(n=22,095; 74% of eligible patients), 15.3%
(14.8–15.8%) reported any past-year use: 12.2%
(11.8%–12.6%) less than daily and 3.1%
(2.9%–3.3%) daily. Among 2,228 patients
18–29 years, 36.0% (34.0%–38.0%)
reported any cannabis use and 8.1%
(7.0%–9.3%) daily use. Daily cannabis use was common
among men 18–29 who used tobacco or screened positive for
depression: 25.5% (18.8%–32.1%) and
31.7% (23.3%–40.0%), respectively.
Conclusions
Cannabis use was common in adult primary care patients, especially
among younger patients and those with behavioral health conditions. Results
highlight the need for primary care approaches to address cannabis use.