Three hours into a ceremony in the Brazilian rainforest, a woman feels her chest grow heavy. She tastes ash. Not metaphorical ash — the specific, gritty bitterness of a cold ashtray. She purges. A week later, she stops smoking. For good.

That account, drawn from a Brazilian survey on ayahuasca and tobacco use, sounds almost too neat. But it's not an isolated story. Among the people researchers spoke to in that study, hundreds described some version of the same thing — a ceremony, a body-level rejection of cigarettes, and a habit that loosened its grip in ways nicotine patches never managed. The question worth asking is whether there's something real underneath the anecdotes, and if so, what it actually means for someone considering an ayahuasca retreat as part of their own attempt to quit.

Why Smoking Is So Hard to Quit in the First Place

Tobacco is the second-leading risk factor for premature death on the planet, just behind high blood pressure. Roughly 1.5 billion people still smoke, and the World Health Organization estimates that about half of them want to stop. The trouble is that wanting to stop and actually stopping are two different sports. Standard treatments — nicotine replacement, varenicline, behavioral counseling — hover around a 30% success rate at one year. That's not nothing. But it leaves a lot of people cycling through relapses, wondering what's wrong with them.

Nicotine isn't just chemically sticky. The habit weaves itself into mornings, drives, breakups, deadlines, drinks with friends. You're not quitting a molecule. You're quitting a thousand tiny rituals stitched into your nervous system. Which is partly why researchers have started looking, seriously, at substances that can disrupt the whole pattern at once.

Where Psychedelics Enter the Picture

The renewed interest in psychedelic-assisted addiction work didn't come out of nowhere. There's a pilot study out of Johns Hopkins from 2014, small but striking, where psilocybin was used as part of a structured smoking-cessation program. Six months out, between 70 and 80 percent of participants were still abstinent. Compared with conventional approaches, that's a wild number. Caveat: the study was small, there was no placebo group, and the participants were highly motivated. Still, it cracked open a serious conversation.

Ayahuasca sits in a slightly different lane. It's been used ceremonially in the Amazon for centuries, and in Brazil it has a legal religious framework through churches like Santo Daime and the UDV. Plenty of people in those communities — and in the broader plant medicine world — have noticed, over the years, that long-term participants tend to use fewer drugs across the board. Cigarettes included. That's anecdotal, but it's the kind of anecdote that piles up until somebody decides to count it.

What the Brazilian Survey Actually Found

The study in question, run out of the University of Campinas (UNICAMP), surveyed 441 people who had either quit or significantly cut down on smoking after one or more ayahuasca experiences. The researchers split them into two groups — full quitters and reducers — and looked for the variables that distinguished them.

A few findings stand out. First, the people who quit outright tended to have had heavier smoking histories. Started younger. Smoked more per day. Higher dependence scores. So this wasn't a case of light social smokers casually dropping the habit. Second, two variables tracked strongly with full cessation:

• Intensity of the mystical experience. The more profound the participant rated their ceremony — using a validated questionnaire psychedelic researchers have leaned on for years — the better the odds they quit instead of merely cut back.
• Frequency of ayahuasca use. People drinking roughly every two weeks were more likely to quit than those drinking once a month or less.

That second finding is interesting because it suggests something beyond a single, life-rearranging insight. Repeated exposure seems to matter. The brew, it appears, isn't only working through the dramatic peak experience — though that helps — but also through some kind of accumulating effect over time.

What People Said Happened in the Ceremony

The qualitative side of the research is where things get vivid. Participants were asked to describe, in their own words, the experience that contributed most to their quitting. Four themes kept showing up.

1. Acquired awareness. Sudden, clear insight into why they smoked — boredom, anxiety, identity, grief — and an equally clear sense of what cigarettes were doing to their bodies. Less a lecture, more a knowing.
2. Sensory aversions. Tastes, smells, and visions of smoking that were straight-up disgusting. The ashtray taste mentioned earlier. The smell of stale smoke filling the maloca. Visions of blackened lungs. The body, in effect, saying no on the smoker's behalf.
3. Purging. The unglamorous but well-known feature of ayahuasca — vomiting, sometimes diarrhea — often described as cleaning something out. Some participants reported purges that smelled or tasted of tobacco. Make of that what you will, but for the people inside the experience, it felt like a literal eviction.
4. Spiritual encounters. Meetings with entities, ancestors, or a felt sense of contact with something larger. Often these encounters carried a message about mortality — about how close cigarettes were taking them to it, and what they were trading away in the process.

None of these are guarantees. Plenty of people drink ayahuasca and don't quit smoking. But the pattern across hundreds of accounts is hard to dismiss as coincidence.

So How Might It Actually Work?

Researchers tend to group the possible mechanisms into three buckets, and ayahuasca probably operates across all of them.

Physiological. The brew contains DMT and beta-carbolines that act on serotonin receptors and seem to promote neural plasticity — the brain's capacity to form new connections. There's also evidence of anti-inflammatory effects. Translated into plain English: for a window of time after a ceremony, your brain may be unusually open to laying down new patterns and dropping old ones. That's a useful window for an addiction.

Psychological. The mystical experience itself — that sense of unity, sacredness, transcendence of ordinary time — has been linked in multiple studies to lasting behavior change. Something about the magnitude of the experience seems to reset what feels important. A habit that mattered enormously on Tuesday afternoon can feel small and absurd by Sunday morning.

Contextual. Ceremony matters. The setting — the maloca, the icaros, the facilitators, the other participants going through it alongside you — provides a container that's almost impossible to replicate with a pill in a clinic. Repeated participation in that container, over months or years, reinforces a different way of relating to substances generally.

What This Means If You're Considering a Retreat

Here's where I want to be honest with you. The Brazilian study didn't ask, what percentage of people who try ayahuasca quit smoking? It started with people who had already quit or cut back and worked backward. So the data tells us something real about the mechanism, but it doesn't tell us your odds.

If you're thinking about an ayahuasca retreat partly because of a smoking habit — or drinking, or any compulsive pattern — a few things are worth holding in mind:

• Don't go just for the addiction. People who arrive at ceremony with a single, transactional goal — fix this one thing — often have a harder time. The experience tends to go where it wants to go. Be open.
• One ceremony is rarely the whole story. The research suggests repeated exposure matters. A weekend retreat is a beginning, not an ending.
• Integration is where the work happens. The ceremony shows you something. The weeks and months afterward are where you either build on it or let it fade. Therapy, journaling, community, support groups — they all matter.
• Vet the retreat carefully. Look for facilitators who screen for medications (SSRIs and MAO inhibitors don't mix with ayahuasca), provide medical staff, and offer real integration support. Anyone promising to cure your addiction is selling you something.
• Plan for the dip. Some people quit immediately after a ceremony and never touch a cigarette again. Others reduce gradually. Others find the urge comes back in a few weeks and need to do more work. All of those are normal.

It's also worth saying: ayahuasca is not a casual undertaking. The dieta beforehand, the physical purging, the emotional intensity — these are real demands. If you're medically fragile or on certain prescriptions, this path may not be safe for you, and a conversation with a knowledgeable doctor needs to happen before anything else.

The Honest Bottom Line

Plant medicine research is at an interesting moment. The evidence for ayahuasca as a tool in addiction work — including smoking cessation — is suggestive, sometimes striking, but still early. The Brazilian data adds weight to what Indigenous communities and Brazilian churches have been observing for a long time: something about this brew, in the right container, can disrupt patterns that nothing else seems to touch.

That's not a sales pitch for ceremony. It's a reason to take the option seriously if you've exhausted the usual routes and you're weighing whether to step into something older and less predictable. If something in this piece resonates and you want to explore further, curated ayahuasca retreats from vetted facilitators can be browsed on our marketplace here. Whatever you decide, decide it slowly, ask hard questions of any place you're considering, and give yourself permission to let the answer be no if the timing isn't right.