Relapses Among Recovering Drug Users Drive Spread, but Media Awareness Can Curb It, Model Shows

The spread of drugs continues to pose a significant threat to societies, and researchers at the University of Baghdad in Iraq have turned to mathematical modeling to explore how two factors—media coverage and relapse among recovering users—shape that spread. In a study accepted for publication in Frontiers in Applied Mathematics and Statistics, Melad Jameel Hmood and Raid Kamel Naji propose and analyze a model of drug addiction that explicitly incorporates the positive role of media in raising public awareness, while also addressing the problem of relapse after recovery.

The motivation is straightforward: given the widespread reach of various media outlets and ongoing technological advancements, media-based awareness campaigns can contribute to curbing drug abuse and preventing relapse following recovery. Rather than treating recovered individuals as permanently removed from the dynamics of drug use, the model allows them to return to drug use, capturing a feature the authors argue is essential for understanding how addiction persists in populations.

Technically, the study examines the properties of the solutions and the model’s dynamics in detail. They also discuss bifurcation behavior—the qualitative changes in the model’s long-term behavior as parameters such as the relapse rate or the intensity of media awareness are varied.

The authors’ analysis, however, uncovers a more complicated picture: they report the occurrence of backward bifurcation under relapse even when R0 is less than one, meaning that reducing the reproduction number below the classical threshold may not, by itself, guarantee the elimination of drug use when relapse is present.

To validate the analytical results and assess the impact of varying key parameters, the researchers also conducted numerical simulations. These simulations allowed them to explore how changing the strength of media awareness or the relapse rate alters the trajectory of the model over time, complementing the formal stability and bifurcation analysis with concrete numerical examples.

The simulations and analysis point to a clear inverse relationship between media awareness and relapse in controlling the spread of drugs. According to the authors, increasing media awareness or reducing relapse leads to controlling the spread of drugs and lessening the harm and prevalence of substance abuse in populations. Conversely, decreasing media awareness or increasing relapse leads to a lack of control and drug prevalence in society.

The work is framed as an original research article in the journal’s Dynamical Systems section, and the authors note that the study examines solution properties, stability, and bifurcation behavior as its core contributions. The article was received on 23 August 2026 and accepted on 5 October 2026, with the final formatted version to be published by the journal.

As with any mathematical model, the conclusions reflect the structure and assumptions built into the equations rather than direct measurements of a specific population. The authors state that all claims expressed in the article are solely their own and do not necessarily represent those of their affiliated organizations or the publisher. Nevertheless, the study offers a quantitative framework for a question with real-world stakes: how sustained media attention and relapse prevention together determine whether drug use recedes or persists in a society.

Subject of Research: A mathematical model of drug addiction incorporating media awareness campaigns and relapse after recovery

Article Title: How do relapses among recovering people affect the spread of drugs in the presence of media coverage

Article References: Hmood, M. J., & Naji, R. K. (2026). How do relapses among recovering people affect the spread of drugs in the presence of media coverage. Frontiers in Applied Mathematics and Statistics, 12, Article 1976377. https://doi.org/10.3389/fams.2026.1976377

Image Credits: AI Generated

DOI: 10.3389/fams.2026.1976377

Keywords: drug addiction, mathematical model, media awareness, relapse, backward bifurcation, reproduction number, stability analysis, numerical simulation, dynamical systems, epidemiology, relapses, recovering