The Fridge Cigarette: A Systems Thinking Review of Sugar-Free Harm, Commercial Determinants, and the CHAMP Framework for Child-Led Counter-Advocacy in Adolescent Oral–Systemic Health

Background: The “fridge cigarette” is a social-media phenomenon in which a chilled diet carbonated soft drink (CSD) is ritualised as an adolescent stress-relief practice using the symbolic grammar of cigarette consumption. It presents an analytic problem for conventional prevention because its flagship product is sugar-free: harm is mediated not by sucrose but by acidity, non-nutritive sweetener exposure, and a transplanted dependency ritual. Linear exposure–outcome models do not account for the phenomenon’s propagation, its resistance to information-based correction, or the limited traction of existing regulation. Objective: To analyse the phenomenon as an instrumental case of a commercial determinant of health operating as a complex adaptive system, and to derive an implementable, theory-grounded intervention sited at high-leverage points in that system. Methods: A systems thinking review structured as a single instrumental case study. Evidence was assembled across five predefined system domains and synthesised using three established instruments: qualitative causal loop mapping with explicit link-polarity coding and evidence grading; systems-archetype analysis expressed as falsifiable propositions; and leverage-point classification following Meadows, in the shallow-to-deep formulation of Abson et al. Results: The case system comprises three reinforcing loops (R1 algorithmic amplification; R2 identity–affect reward; R3 commercial reinvestment) and one balancing loop (B1 clinical–regulatory correction). Loop-dominance analysis indicates that R1–R3 operate on cycle times of hours to months, whereas B1 carries a multi-year exposure-to-detection delay and low gain at two of three links, rendering it structurally incapable of stabilising the system. Four archetypes (Fixes that Fail, Shifting the Burden, Success to the Successful, Tragedy of the Commons) each predict that symptom-directed interventions will strengthen the reinforcing loops. Leverage classification shows the current policy repertoire concentrated in shallow tiers (L12–L6); no current instrument addresses the paradigm tier (L2–L1) at which the phenomenon operates. Conclusion: The analysis specifies CHAMP (Child-led Health Advocacy for Misinformation and Prevention), a peer-delivered counter-system of five sequenced levers mapped to deep leverage points, designed to re-aim the amplification loop rather than oppose it. The dental encounter is identified as the system’s earliest observable sensor, positioning pediatric dentistry to close the corrective feedback that currently fails. Recommendations are ranked by leverage depth, and an explicit falsification condition is stated.