Older-Adult Marijuana Users in Substance Use Treatment: Characteristics Associated with Treatment Completion

More older adults are using marijuana and receiving substance use treatment. We used the 2015-2017 Treatment Episode Data Set-Discharges (TEDS-D) to identify characteristics associated with treatment discharge among those aged 50+ whose admission involved marijuana use. Among these discharges (N = 130,287), 7.0% had been admitted for marijuana use only and 93.0% for polysubstance use (13.0% marijuana-primary, 57.7% marijuana-secondary, and 22.3% marijuana-tertiary), and the overall treatment completion rate was 45%. Using logistic regression, we examined associations of detoxification, residential rehabilitation, and outpatient treatment completion with type of marijuana and other substance involvement. Compared to marijuana-only cases, marijuana-tertiary cases had higher odds of completing detoxification (AOR = 1.54, 95% CI = 1.16-2.03), marijuana-secondary cases had higher odds of completing residential rehabilitation (AOR = 1.19, CI = 1.01-1.40), and all polysubstance cases had lower odds of completing outpatient treatment. Of the polysubstance cases, treatment completion odds were higher for those with alcohol problems but lower for those with other illicit drug problems. Previous treatment, referral source, psychiatric problems, first age of marijuana use, and racial/ethnic minority status were significant factors in treatment completion. Better strategies are needed to promote treatment retention and completion among older adults admitted for marijuana use problems, especially those who also have other illicit drug problems.