The Olfactory-Limbic Axis in Cannabis Use: A Comprehensive Dual-Mechanism Model of Thermal Trauma and Pharmacological Blunting

The intersection of olfaction, memory consolidation, and emotional regulation presents a profound neurological framework for understanding the long-term cognitive effects of chronic marijuana use. This manuscript proposes a synergistic dual-mechanism model to explain the memory loss and affective flattening that is frequently observed in chronic cannabis users. First, we evaluate a novel biomechanical hypothesis that unfiltered, high-heat cannabis smoke travels retro-nasally, inflicting repeated thermal and chemical trauma to the exposed olfactory nerve fibers traversing the porous cribriform plate. Second, we examine the pharmacological suppression of the endocannabinoid system via THC binding at CB1 receptors.

By physically severing peripheral sensory input at the mucosal level and simultaneously short-circuiting downstream memory encoding and mesolimbic reward circuitry, chronic cannabis use strips away the fundamental neuro-amplifiers of cognitive and affective resonance. The brain's reliance on this sensory actuation makes the dual mechanism particularly harmful to a user's long-term motivation and emotional vibrancy. This paper synthesizes current neuroanatomical, thermodynamic, and pharmacological literature to establish a comprehensive foundation for the olfactory-limbic theory of cannabis-induced cognitive blunting.

Keywords: Olfactory Nerve, Cribriform Plate, Amotivational Syndrome, Thermal Trauma, Memory Loss