Adults with cannabis, alcohol or nicotine use disorder faced a much higher risk of developing generalized anxiety disorder within a decade than adults with no substance use disorder history. Addiction treatment that produced remission cut that risk substantially.
What the Study Found
Researchers led by Xiaoxiao Zhang at the Campbell Family Mental Health Research Institute in Toronto analyzed data from the National Epidemiologic Survey on Alcohol and Related Conditions-III, a nationally representative US survey conducted in 2012 and 2013.
The analysis covered 6,685 adults with alcohol use disorder, 1,500 with cannabis use disorder, 6,673 with nicotine use disorder and 16,117 adults without any substance use disorder.
Within 10 years of substance use disorder onset, the cumulative incidence of a first generalized anxiety episode was 7.06 percent in the cannabis use disorder group, 5.45 percent in the nicotine group, 5.22 percent in the alcohol group and 4.78 percent in a pooled group of people with any substance use disorder.
Among controls, it was 1.34 percent. The risk peaked near the five-year mark for the cannabis group and stayed higher there than in any other group studied.
Why Cannabis Stood Out
Cannabis use disorder carried the highest 10-year anxiety incidence of the three conditions, outpacing both alcohol and nicotine. Addiction to cannabis is often looked at as a lower-risk relative to other substance use disorders. Anxiety complaints among cannabis users can be easy to attribute to something else.
The researchers also found that risk climbed with complexity. Among people with one substance use disorder, 8 percent went on to develop generalized anxiety disorder. This was compared with 10.2 percent among those with two disorders and 11.5 percent among those with three. Among controls, that figure was 3.5 percent.
Remission Changed the Picture
The hazard ratio was 0.44 for alcohol use disorder, 0.33 for cannabis use disorder, and 0.45 for nicotine use disorder, all were statistically significant.
People whose substance use disorder went into remission developed generalized anxiety at less than half the rate of those still active in their disorder.
Comorbidity mattered in both directions. Participants who also had mood disorders, other anxiety disorders, or personality disorders saw their generalized anxiety risk rise significantly across all substance use groups, with hazard ratios between 1.91 and 2.70.
What This Means for Treatment Seekers
If you or a family member is evaluating rehab options, this study supports choosing programs that screen for and treat co-occurring anxiety rather than substance use alone.
It also reinforces that remission is achievable and that reaching it carries mental health benefits beyond stopping use, cutting downstream anxiety risk by more than half.
The Study’s Limits
The authors note several caveats worth keeping in mind. Onset ages were self-reported in whole years, which introduces recall bias.
High censoring rates and analytic exclusions reduced the number of anxiety events observed, which limits precision for some findings.
The team also tested multiple predictors without adjusting for multiple comparisons, meaning some associations could be due to chance.
These limits argue for reading the results as directional rather than definitive.
Exploring Treatment Options
Choosing a program that handles dual diagnosis starts with a few concrete steps. Ask any facility you contact whether it screens for anxiety and mood disorders during intake and whether it treats them alongside substance use.
Compare rehab centers that offer integrated care, and verify that clinicians on staff are licensed to treat both conditions. Understanding insurance coverage for addiction treatment and mental health treatment before you commit can also prevent surprises later.
Rehab.com’s directory includes verified treatment centers across the country, including programs that specialize in co-occurring conditions. Call
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