Nicotine: evolution, dependence, and the path to total quit: redefining cessation in a changing nicotine landscape
www.frontiersin.org
Oct. 3, 2026, 7:41 a.m.
# Professional Summary
The nicotine marketplace has undergone significant transformation, extending beyond traditional combustible cigarettes to encompass electronic nicotine delivery systems (ENDS), heated tobacco products (HTPs), nicotine pouches, and licensed medicinal nicotine products. This expansion has fundamentally altered exposure patterns, dependence mechanisms, and cessation outcomes, creating complexity in defining what "quitting" means in clinical and public health contexts. Researchers from Roswell Park Comprehensive Cancer Center, NHS Surrey, and Charité Universitätsmedizin Berlin conducted a comprehensive narrative review synthesizing evidence from neurobiology, epidemiology, clinical research, and population-level data to examine nicotine dependence across product categories. The analysis reveals that nicotine dependence results from interactions between pharmacological factors, delivery kinetics, behavioral conditioning, and deliberate product design features. While complete switching from combustible cigarettes to non-combustible alternatives may reduce exposure to smoking-related toxicants, these products frequently sustain nicotine dependence, facilitate dual use, and create new initiation pathways among previously nicotine-free individuals. Current cessation frameworks inadequately distinguish between smoking abstinence and complete nicotine cessation, particularly for long-term users of alternative products. The researchers advocate redefining optimal cessation endpoints to embrace "Total Quit"—complete freedom from nicotine dependence—and recommend tailored support addressing all nicotine product types.