Does CBD for smoking cessation actually work? Three small human studies have produced encouraging clues: fewer cigarettes in one, less attention to smoking cues in another, and less short-term withdrawal among nicotine-vape users in a third. None showed that CBD improves long-term quit rates. A larger trial is finally underway, but for now CBD is an experimental possibility, not a proven quitting aid.
The inhaler pilot: fewer cigarettes, but not less craving
In a small 2013 trial, 24 smokers who’d expressed an intention to quit were randomly given a CBD inhaler — a metered device delivering roughly 400 micrograms of CBD per inhalation — or a matching placebo inhaler, and told to use it whenever they felt the urge to smoke, for one week. The CBD group reported smoking about 40% fewer cigarettes than at baseline, while the placebo group did not change. The difference between the groups narrowly missed the conventional threshold for statistical significance, so this is an encouraging signal rather than a confirmed effect. The experimental inhaler was not the same thing as a retail CBD vape, so this study is not evidence that vaping CBD is a safe or effective quitting strategy.
It also came from two dozen people over seven days, and it’s never been repeated at a larger scale in the decade-plus since. And the reduction happened without any change in how much participants reported craving cigarettes day to day — people apparently smoked less while wanting to smoke just as much. There was some indication the drop in cigarette use held up somewhat at a follow-up check, but that’s a note on continued cigarette counts, not a tracked quit rate.
The 800 mg study: it changed attention, not the urge to smoke
A 2018 trial gave 30 dependent smokers, abstinent overnight, a single 800 mg oral dose of CBD or placebo in a crossover design. After the CBD dose, participants showed less of the attentional pull toward cigarette images that abstinent smokers normally show, and they rated cigarette photos as less appealing. That’s a real shift in how the brain responded to smoking cues.
What it didn’t do matters just as much: the same study found no effect on craving or withdrawal symptoms. CBD changed one narrow measure of cue-reactivity without reducing the craving or withdrawal symptoms smokers actually reported — and cue-reactivity itself may only be one piece of what drives relapse, not a stand-in for it. It was also a single dose, tested once — not a maintenance regimen, and nothing here shows what repeated dosing over weeks would do.
A small vaping study: less withdrawal, but no quit test
A third study gave 20 daily nicotine-vape users 320 mg of oral CBD during a four-hour period without vaping. Participants reported less withdrawal and less anxiety than during abstinence without CBD. That’s another encouraging human signal, but the study was open-label, had no placebo group, and didn’t test whether anyone actually quit. It also involved vaping rather than cigarettes, so it doesn’t speak to cigarette smoking directly.
What hasn’t been shown
All three of these are genuinely interesting pilot results. None is a green light. We could not find a larger or longer randomized trial of CBD for smoking cessation published since the 2013 inhaler study — a decade of promising-but-unconfirmed is itself the most important thing to know here, more than any individual result.
A larger answer may be coming. A phase 2 trial aiming to enroll around 120 smokers is testing 800 mg of CBD daily for eight weeks, with follow-up at one and three months after treatment ends. Until it reports, though, CBD remains an experimental idea rather than an established quitting aid.
The dose gap is also real: the 2018 study used 800 mg of CBD in one sitting, and a typical over-the-counter CBD product delivers something like 10–25 mg per serving. That’s not a reason to take more of a retail product to chase the trial’s effect — nobody has tested what higher at-home doses do, and more isn’t automatically safer. It’s a reason for caution about how far these findings actually stretch to what’s sold in stores.
A possible mechanism, still just a lab finding
There’s a laboratory reason CBD and nicotine might interact directly: an in-vitro study using human liver tissue found that CBD partly blocks CYP2A6, the enzyme responsible for most nicotine breakdown in the body. If that holds up in people, it could mean CBD slows how fast nicotine clears the body — which might affect cravings, or might just affect nicotine blood levels without changing how anyone feels. This is a cell-and-tissue finding, not a finding in smokers, and the researchers who ran it said as much: it’s a reason to study this in people, not a mechanism you can bank on yet.
What’s actually been shown to work
CBD is not the best-supported starting point for someone trying to quit. Nicotine replacement therapy, varenicline, bupropion, and behavioral support through a quitline or counselor all have much larger and more consistent evidence bases than CBD. Nothing here should be read as a substitute for those.
If you want to try CBD alongside a real quit attempt, it’s worth knowing that what the studies actually used — a low-dose inhaler used at the moment of an urge, or single oral doses of 320 or 800 mg — is different from most CBD gummies, tinctures, or vapes sold at typical retail servings. And because CBD can affect how the liver processes other drugs, anyone on prescription medication should check for interactions before adding CBD; our CBD and drug interactions article covers how that works, and our guide to CBD’s different forms covers how inhaled and oral CBD actually differ in the body. CBD’s still-mixed evidence for anxiety, if withdrawal irritability is part of what makes quitting hard, is covered separately in our CBD and anxiety article.
A note on hemp cigarettes
Some smokers switch to hemp cigarettes thinking they’re swapping out the harm along with the nicotine. Smoking hemp is still smoking — still combustion, still inhaled smoke — so it isn’t a clean substitute. Our hemp cigarettes article covers that in full.
Quitting smoking is one of the best things you can do for your health, however you get there. If you’re ready to quit, talk to a doctor or pharmacist about cessation support that’s actually been shown to work — this article isn’t medical advice, and it isn’t a plan for quitting on its own.
