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California Cannabis Use Held Steady After Legalization, New Study Finds

California Cannabis Use Remained Stable After Legalization

California’s experience with adult-use cannabis legalization is offering an important reality check for policymakers still predicting that legalization will lead to a dramatic surge in marijuana consumption.

A new study published in the Journal of Cannabis Research found that the prevalence and frequency of adult cannabis use in California remained largely stable during the eight-year period surrounding the launch of legal retail sales. The analysis followed statewide trends from 2017—the year before licensed adult-use sales began—through 2024.

The findings suggest that legalization changed the legal framework around cannabis far more dramatically than it changed how many California adults used it.


What the California cannabis legalization study found

Researchers from the University of California, San Diego analyzed California Health Interview Survey data from 178,836 adults ages 18 and older. Legal adult-use cannabis sales began in California on January 1, 2018, giving researchers one year of pre-retail data and seven years of post-retail data to compare.

Across the full study population, 24.7% of respondents reported using cannabis during the previous year and 16.4% reported using it during the previous month.

The year-to-year comparison was especially notable:

  • Past-year cannabis use was 22.1% in 2017 and 23.5% in 2024—a difference that was not statistically significant.

  • Past-month use increased temporarily from 14.5% in 2017 to 17.7% in 2018, but declined to 15.4% by 2024. The 2024 figure was not statistically different from the pre-retail rate.

  • The frequency of past-month consumption also remained stable over the study period.

  • Past-month use among young adults ages 18 to 25 did not significantly change.

In plain English: California created the nation’s largest regulated adult-use cannabis marketplace without producing the runaway, population-wide rise in adult consumption that opponents frequently warn about.


Legalization changed how adults consume cannabis

Although the number of adults using cannabis remained largely steady, the products they chose changed substantially.

The share of consumers reporting combustible methods—including joints, pipes and bongs—declined from 71.2% in 2017 to 58.1% in 2024. During the same period, edible use increased from 40.3% to 53.6%.

That shift matters. It demonstrates that a regulated market does more than replace criminal penalties with legal access. It also gives adults more ways to consume cannabis, including options that do not require inhaling smoke.

This does not make every non-combustible product risk-free. Edibles require clear labeling, responsible dosing, secure storage and consumer education because their effects can take longer to begin and last longer than inhaled cannabis. But those are precisely the kinds of public-health issues that regulation can address through testing, packaging standards and accurate information.

Prohibition cannot offer those protections. It leaves consumers with an illicit market that has no obligation to verify potency, test for contaminants or provide consistent instructions.


Cannabis use increased among some older adults

Researchers did identify changes within particular age groups. Past-month cannabis use among adults ages 40 to 59 increased from 10.7% in 2017 to 14.5% in 2024. Among adults ages 75 and older, it rose from 2.4% to 5.5%.

The study did not establish why these increases occurred, so the numbers should not be treated as proof of any single explanation. Still, the trend is consistent with cannabis becoming more visible and accessible to adults who may previously have avoided it because of stigma, criminal penalties or the limitations of an illicit marketplace.

For policymakers and healthcare professionals, growing use among older adults reinforces the need for honest, age-appropriate education about dosing, medication interactions, impairment and the differences among inhaled products, edibles and other formulations. It is an argument for better education—not a return to arrests and prohibition.


What California’s results mean for the legalization debate

Opponents often describe legalization as if legal access automatically causes widespread new use. California’s statewide data do not support that simplistic assumption.

The study cannot answer every question about legalization. It was observational, relied on self-reported survey responses and did not prove that retail legalization caused every change recorded between 2017 and 2024. The period also included the COVID-19 pandemic and other social changes that may have influenced consumer behavior.

Even with those limitations, the scale and duration of the analysis make the larger conclusion difficult to ignore: adult cannabis use remained broadly stable after retail legalization, while consumption methods and the age profile of some consumers evolved.

That distinction should matter in Florida, where discussions about cannabis policy are still too often driven by fear-based predictions instead of evidence. Legalization is not an endorsement of cannabis use for everyone. It is a decision to regulate an existing adult behavior, replace punishment with public-health safeguards and stop treating responsible consumers like criminals.

California’s experience shows that lawmakers do not have to choose between regulation and responsibility. A legal system can include age restrictions, product testing, labeling, education and impaired-driving enforcement without relying on prohibition.


Evidence should guide cannabis policy

After decades of exaggerated claims about marijuana legalization, researchers now have years of real-world data from legal states. Those findings deserve more weight than political talking points.

California did not experience an uncontrolled rise in adult cannabis use after licensed sales began. Instead, use remained largely stable, young-adult monthly use did not significantly change, consumers moved away from combustible products and participation increased among some middle-aged and older adults.

The responsible response is not to ignore the areas that require continued education and research. It is to build policy around what the evidence actually shows.

Cannabis legalization should be evaluated by measurable outcomes—including public health, consumer safety, criminal justice, illicit-market activity and access to accurate information—not by repeating predictions that the data fail to confirm.


Credit and sources

This article was inspired by and adapted from National NORML’s August 13, 2026 report, “California: Cannabis Use by Adults Holds Stable Post-Legalization.” Suncoast NORML thanks National NORML for its original reporting and continued work reforming marijuana laws.

Suncoast NORML advocates for evidence-based cannabis policy, responsible regulation and an end to the criminalization of marijuana consumers.


 
 
 

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