Addiction

Addiction is described not simply as a powerful craving but as a pattern that can narrow thought, harden a person’s account of who they are, and make repeated behavior feel inevitable. The book links this rigidity to brain systems involved in self-reflection and considers how psychedelic-assisted therapy might interrupt it. Its account holds two claims together: a vivid experience may help some people see their lives differently, but the experience takes place within a therapeutic structure and does not reliably or automatically end an addiction.

Addiction as a Rigid Pattern

In the account of Robin Carhart-Harris’s model, addiction belongs among psychological conditions associated with excessively ordered, low-entropy thought. The problem, on this view, is not necessarily a brain lacking order; it may be an excess of it. Self-reflective habits can deepen into grooves, and the Ego can become so dominant that thought circles within a narrow range. Depression offers a particularly clear parallel: repetitive self-focused thought may crowd out the world beyond it. Addiction, obsessions, and eating disorders are also discussed as conditions in which entrenched patterns of thinking and behavior may be susceptible to disruption.

This model shifts attention from the addictive substance or behavior alone to the mental organization that sustains it. A person may know that smoking is harmful and still remain caught in a familiar loop. Matthew Johnson describes addiction as a story reinforced by attempts to quit that end in failure: the smoker comes to identify as someone powerless to stop. That narrative does more than describe the habit; it can help make the habit seem fixed. A psychedelic experience, in Johnson’s account, may create distance from the story and allow the person to see short-term pleasure against the longer span of a life.

The Smoking-Cessation Study

Johnson’s smoking-cessation study at Johns Hopkins University began in 2009. Fifteen volunteers trying to quit first received several sessions of cognitive behavioral therapy and then two or three psilocybin sessions. The study was open-label, with no placebo group, so participants knew they were receiving the drug. They had to stop smoking before a session; investigators measured carbon-monoxide levels at several intervals to check their abstinence.

The outcomes were striking, particularly given the difficulty of quitting smoking, but the small, nonrandomized design limits what they establish. Six months after the psychedelic sessions, 80 percent of the volunteers were confirmed abstinent. At one year, the rate was 67 percent, still higher than the best treatment then available. The participants who had the most complete mystical experiences had the best outcomes. Charles Bessant, one of the volunteers, had remained abstinent for six years when the book described him. His summary was direct: “Smoking became irrelevant, so I stopped.”

That account suggests a change in salience rather than a newly acquired fact. Smokers generally know that smoking is unhealthy, costly, and unnecessary; what may change during a session is the felt force of that knowledge. One participant, Savannah Miller, sat up during a session and announced the practical insight, “Eat right. Exercise. Stretch.” Johnson calls such realizations “duh moments,” but argues that their apparent obviousness does not make them trivial. A familiar conclusion can become harder to evade when it is felt with unusual immediacy, rather than remaining an abstract proposition.

Perspective, Intention, and Therapy

The book compares this altered vantage on a personal life to the overview effect associated with astronauts seeing Earth from space. Some volunteers described gaining distance from circumstances that had once seemed overwhelming, including their addictions. From that larger perspective, old habits could appear smaller and more manageable. In this analogy, the experience did not supply a new list of facts about smoking; it changed the scale and emotional force with which a person regarded a life and its habits.

The proposed mechanism is not treated as an automatic consequence of taking psilocybin. The intention to break the habit is established in advance and reinforced by therapists during preparation and integration. The journey’s “set”—the expectations and purpose brought to it—is deliberately shaped. The book therefore distinguishes psychedelic-assisted therapy from treatment by drug alone: the therapeutic relationship and the work surrounding a session are part of the intervention. Many people have taken psilocybin and continued to smoke, a reminder that the possible shift in perspective is neither universal nor guaranteed.

The researchers also consider why ordinary insights can acquire unusual authority in a psychedelic session. Thoughts may become visible in vivid, memorable forms, even when the person recognizes that what is seen is not physically present. The book proposes that this vividness can make an insight feel more concrete and lasting. Johnson’s broader image is that a sufficiently dramatic experience can interrupt an established mental model—a temporary opening in which a person may reconsider the story organizing reality, rather than simply hearing advice to change.

The Self-Narrative and the Brain

The book connects this account of addiction to the default mode network, a system associated with self-reflection and the coherent sense of self. Carhart-Harris proposes that psychedelics can quiet this network and loosen the Ego’s grip, permitting a less constrained mode of cognition. In this framework, the target is not only a particular craving but also a habitual style of thought that places the self at the center. The same broad pattern is used to connect addiction with depression and with the repetitive fear experienced by some cancer patients.

Judson Brewer’s research offers a more specific account of self-referential processing. The posterior cingulate cortex, a centrally located node in the default mode network, links the prefrontal cortex—associated with planning and executive function—to memory and emotion centers in the hippocampus. Brewer describes it as involved in how people relate to their thoughts and feelings. Having a craving is not the same as becoming caught up in it; the distinction helps explain how a person might experience an urge without treating it as a command or as proof of an unchangeable identity.

Brewer also connects this account with Buddhist teachings about attachment. He proposes that reducing posterior cingulate activity, through meditation or psychedelics, may help people remain with thoughts and cravings without being absorbed by them. The proposed connection is not presented as proof that neuroscience has established the cause of addiction or a universal cure. Rather, it gives a possible account of how loosening self-referential habits could matter: the craving may remain, but a person’s relationship to it can change.

Significance and Limits

Across the clinical examples, addiction becomes one instance of a larger problem of being trapped in a self-reinforcing mental pattern. Psychedelics are of interest because they may temporarily increase cognitive flexibility and unsettle that pattern, not because they simply erase a habit. The treatment’s promise lies in the possibility that a person can see an established behavior in a wider context and respond differently to it.

The evidence described remains qualified. The smoking study involved only fifteen volunteers, lacked randomization and a placebo comparison, and cannot by itself establish how much of the outcome came from psilocybin, therapy, participant expectations, or their combination. A larger randomized comparison with the nicotine patch was under way at the time of the account. The book’s strongest conclusion is therefore about a therapeutic possibility and its proposed conditions: a meaningful intention, careful preparation, a supported session, and integration afterward may help some people loosen the story that keeps an addiction in place.