How Cannabis Use Patterns Differ by Age Among Medical Dispensary Patients | Research

The takeaway

Younger medical cannabis patients used more and showed more problematic use than older patients, especially those who started using regularly at an earlier age.

Read this if you use medical cannabis and want to understand how age and usage patterns relate to problematic use.

Younger medical cannabis users showed higher problematic use despite similar frequency as older patients

What the researchers found

This dispensary-based study compared 217 medical cannabis patients across three age groups: younger (18-30), middle-aged (31-50), and older (51-72).

All age groups used cannabis at similar frequencies over the past month. However, younger users consumed larger quantities and showed higher rates of problematic cannabis use compared to middle-aged and older adults.

The relationship between age and problematic use was shaped by when someone started using regularly. Among younger users, earlier initiation of regular cannabis use predicted more problematic use. This pattern did not hold for older users.

Middle-aged adults were more likely to use cannabis for insomnia. Older adults were more likely to use it for chronic conditions like cancer, glaucoma, and HIV/AIDS. Younger users more often reported using cannabis when bored.

Why it matters

As medical cannabis access expands, understanding age-related patterns of use helps clinicians identify patients at higher risk for problematic use. The finding that younger patients use more and show more problems despite similar frequency suggests that medical cannabis programs may need age-specific monitoring.

The numbers in context

217 participants across three age groups (18-30, 31-50, 51-72). All groups had similar monthly frequency of use, but younger users consumed greater quantities and had higher problematic use scores.

How the study worked

Cross-sectional data were collected at a medical cannabis dispensary in San Francisco. The 217 participants were grouped by age and compared on cannabis use measures, motives, and medical conditions using ANOVAs, chi-square tests, and linear regression analyses.

What this study cannot tell us

Cross-sectional design at a single San Francisco dispensary limits generalizability. Self-reported data may underestimate problematic use. The sample was not randomly selected and may not represent the broader medical cannabis population.

How to read the evidence

Cross-sectional design at a single site provides useful patterns but cannot establish causal relationships.

When this study was published

Published in 2017, data collected at a San Francisco dispensary.

The bigger picture

This study adds to evidence that age of initiation matters for cannabis outcomes, even in medical contexts. The different motivations across age groups also highlight that medical cannabis is not a monolithic behavior and may require different clinical approaches depending on the patient population.

Questions still open

Do younger medical cannabis patients develop problematic use because of the cannabis itself, or do underlying factors drive both early initiation and problematic patterns? Would structured clinical monitoring reduce problematic use rates among younger medical cannabis patients?

Common questions

Do older medical cannabis patients have fewer problems with cannabis?

In this study, yes. Older patients (51-72) used cannabis at similar frequencies as younger patients but consumed less and showed fewer signs of problematic use. They also used it primarily for chronic medical conditions rather than recreational-adjacent reasons.

Does starting cannabis young lead to more problems?

Among younger users in this study, earlier age of regular cannabis use onset was associated with more problematic use. This pattern was not observed among older users, suggesting early initiation may be a specific risk factor during younger years.

Read the original research

Cannabis use patterns and motives: A comparison of younger, middle-aged, and older medical cannabis dispensary patients.

Addictive behaviors, 72, 14-20

View on PubMed ↗Publisher’s paper ↗

Citation

Haug, Nancy A; Padula, Claudia B; Sottile, James E; Vandrey, Ryan; Heinz, Adrienne J; Bonn-Miller, Marcel O. (2017). Cannabis use patterns and motives: A comparison of younger, middle-aged, and older medical cannabis dispensary patients.. Addictive behaviors, 72, 14-20. https://doi.org/10.1016/j.addbeh.2017.03.006