Two Substances, One Reward Circuit: What the Cannabis-Nicotine Co-Use Crisis Reveals About Adolescent Desire

Cigarette smoking among American adolescents has fallen to historic lows. That decline is real and genuinely good. But Mark Gold's analysis in Psychology Today (June 2026) documents what has replaced the cigarette: a dual-substance pattern in which high-potency THC vapes and discreet nicotine pouches converge on the same reward circuitry, in the same devices, in the same adolescent brain — and mostly out of view.

The numbers are not soft. Between 30% and more than 50% of adolescent e-cigarette users also vape cannabis or THC. Among regular cannabis users overall, approximately half to two-thirds also use nicotine. More than 16 million Americans report concurrent use of both substances. A 2026 study in Nature Mental Health by Heather Ward and colleagues found that heavy cannabis use combined with even light tobacco use nearly tripled the likelihood of developing psychosis among vulnerable individuals. THC concentrations in legal and illicit vape concentrates now frequently exceed 70-90%, a potency profile previous generations of cannabis researchers never studied.

Gold's clinical point is precise: the co-user of 2026 is not the teenager smoking a joint and a Marlboro behind the gym. He or she is carrying a nicotine pouch, vaping high-potency THC intermittently throughout the day, and doing so in settings — classrooms, workplaces, gyms — where combustible products would be immediately detectable. The invisibility of the behavior compounds the addiction risk. Clinicians relying on self-report miss it because patients who vape THC often do not categorize themselves as marijuana users, and patients who use nicotine pouches often do not categorize themselves as smokers.

What the pharmacology says — and what it cannot explain

Nicotine and THC operate through different receptor systems — nicotinic acetylcholine receptors and cannabinoid CB1 receptors respectively — but they converge on the mesolimbic dopamine pathway, the brain's primary reward circuit. Each substance appears to enhance the reinforcing properties of the other. Co-users show higher dependence rates, heavier use patterns, and greater difficulty sustaining abstinence than users of either substance alone. This bidirectionality is not trivial: cannabis users are more likely to initiate nicotine use; nicotine users are more likely to progress to regular cannabis consumption. The two substances function less like parallel habits and more like a single compounding one.

Gabor Maté's account of addiction as rooted in emotional pain and the attempt to regulate an unbearable internal state helps situate the neurochemistry within a human life.[^1] The dopamine story explains the mechanism of entrapment; it does not explain why the adolescent sought the substance in the first place, why the relief felt necessary, or why cessation produces not just physical withdrawal but a confrontation with whatever discomfort the substance was managing.

Disordered desire and the fallen appetite

Thomas Aquinas distinguished between natural appetite — the body's ordered inclination toward what genuinely sustains it — and disordered concupiscence, the pull toward proximate gratification that bypasses reason and will. Addiction is not simply concupiscence intensified; it is concupiscence made structural. Repeated activation of the reward circuit through substances literally reshapes the neural substrate of desire, so that what began as a choice progressively ceases to feel like one. Aquinas would recognize this as habit formation gone wrong: what virtue formation builds through ordered repetition, addiction unmakes through disordered repetition.

The adolescent developmental window is precisely the period when the structures of desire are most plastic. The prefrontal cortex — the neurobiological seat of what Aquinas called the rational appetite, the capacity to evaluate desire in light of long-term goods — is not fully formed until the mid-twenties. The limbic system, which generates the immediate pull toward reward, is already running at full intensity by early adolescence. This mismatch is not a design flaw; it is the developmental condition under which freedom is learned, tested, and consolidated. But it means that substances that hijack the reward circuit during this window do so at the moment of maximum vulnerability.

Gold notes that perceived risk of cannabis has declined even as THC potency has risen. This cultural normalization is itself a formation problem. When a substance is coded as benign — when it appears in music videos, podcast culture, and wellness branding — the adolescent's evaluative faculty receives consistently false data. The cogitative sense, what Aquinas and Benjamin Suazo describe as the interior faculty by which the person assesses particular goods as beneficial or harmful, is being shaped by a social environment that systematically misrepresents the good.

The rebranding of nicotine and the pedagogy of desire

Gold's observation about nicotine's cultural rebranding deserves more attention than it typically receives. For decades, nicotine carried the accumulated social weight of cancer, chronic disease, and moral failure. That stigma — however blunt an instrument — was doing pedagogical work. It encoded information about harm into the cultural imagination. The rebranding of nicotine as a performance-enhancing tool, a Silicon Valley productivity aid, a component of self-optimization culture, does the opposite. It does not merely remove stigma; it inverts the valence, associating the substance with the goods of achievement, focus, and social identity.

This is a formation environment, not merely a marketing environment. Young people are learning what to desire, what to associate with flourishing, what to reach for when they need to concentrate or to belong. The vaping device carried openly in entrepreneurship culture or gaming culture is not just a nicotine delivery system; it is a sign that points toward a particular account of the good life. Formation that takes seriously the unity of appetite, imagination, and social environment — as Catholic anthropology does — cannot treat this as merely a public health communication problem.

The clinical blind spot and what accompaniment requires

Gold identifies a practical screening gap worth taking seriously in pastoral and clinical contexts alike. Cannabis-nicotine co-use is invisible in most clinical encounters because neither biomarker is routinely tested, self-report fails to capture vaping and pouch use, and concurrent withdrawal symptoms — anxiety, irritability, sleep disturbance, impaired concentration — overlap substantially with primary psychiatric presentations. A young person presenting with anxiety may be in cannabis withdrawal, nicotine withdrawal, or both, and the clinician who does not ask specifically about vaping THC and using nicotine pouches will miss it entirely.

The collaborative intake model used in skilled counseling — establishing a shared picture of what the person is actually consuming before proposing any intervention — is not a luxury here.[^2] It is epistemically necessary. The question 'do you use marijuana?' will not produce reliable data in 2026. 'Do you vape anything? What? How often? Do you use pouches?' will.

Pastoral accompaniment faces the same epistemological challenge. A youth minister or school counselor who assumes the absence of cigarettes means the absence of nicotine and cannabis is working with an obsolete model of adolescent substance use. The substances are present; they are simply smaller, more portable, and invisible to anyone who is not looking for them.

What formation must address

A Catholic anthropology of desire does not address addiction simply through willpower or information. It works through the slow reformation of desire — through ordered habit, through the direction of appetite toward its proper objects, and through the relational conditions that make that reorientation possible. Maté's clinical observation that addiction locates itself in the hole left by absent attachment[^1] maps onto the Thomistic account of the will's need for a sufficient good: the person reaches for substances when the goods that properly order desire — friendship, meaning, beauty, God — are absent, inaccessible, or have not yet been adequately encountered.

This means that a formation program serious about the cannabis-nicotine problem cannot confine itself to harm reduction messaging or even to virtue instruction in the abstract. It requires attention to the particular relational environment in which adolescent desire is being shaped. Are the young people in this school, this parish, this family, encountering real friendships, real beauty, real silence, real purpose? When those goods are present and ordered, the pull of the vape device does not disappear, but it competes with something.

Gold is right that the convergence of normalized cannabis, rebranded nicotine, and invisible delivery devices creates a risk environment that is harder to see and therefore easier to underestimate. The pastoral and clinical response requires first learning to see it clearly — the specific devices, the specific patterns, the specific co-use dynamics Gold describes — and then asking the harder question: what is the desire beneath the desire, and what would it take to meet it?

References

Gold, M. S. (2026, June 9). Cannabis and nicotine co-use among youth is rising. Psychology Today. https://www.psychologytoday.com/us/blog/addiction-outlook/202606/cannabis-and-nicotine-co-use-among-youth-is-rising

Ward, H. B., Bai, Y., Vandekar, S., Feola, B., Addington, J., Bearden, C. E., Cadenhead, K., Cannon, T. D., Cornblatt, B., Keshavan, M., Mathalon, D. H., Perkins, D. O., Seidman, L., Stone, W. S., Tsuang, M. T., Walker, E. F., & Woods, S. (2026). Longitudinal cannabis-tobacco co-use and psychosis risk. Nature Mental Health.

Bello, D., Connolly, J. G., Addington, J., Bearden, C. E., Cadenhead, K., Cannon, T. D., Cornblatt, B., Keshavan, M., Mathalon, D. H., Perkins, D. O., Seidman, L., Stone, W. S., Tsuang, M. T., Walker, E. F., Woods, S., Brady, R. O., Jr., Carrion, R. E., & Ward, H. B. (2026). Cannabis and tobacco co-use is associated with impaired neurocognitive performance in individuals at clinical high risk for psychosis. Biological Psychiatry: Cognitive Neuroscience and Neuroimaging. https://doi.org/10.1016/j.bpsc.2026.03.021

Mate, G. (2008). In the realm of hungry ghosts: Close encounters with addiction. Knopf Canada.

Aquinas, T. Summa Theologiae, I-II, qq. 49-54 (On habits); qq. 77-78 (On the cause of sin on the part of the sensitive appetite).

Vitz, P. C., Nordling, W. J., & Titus, C. S. (2020). A Catholic Christian meta-model of the person. Divine Mercy University Press.

Suazo, B. (2020). Psicopatologia y mal moral. Ediciones Universidad San Damaso.