Chapter 33: Smoking Addiction

Smoking addiction represents the leading preventable cause of mortality and morbidity in the United States, with nicotine meeting all clinical criteria for substance dependence including compulsive use, withdrawal syndromes, and reinforcement mechanisms. The epidemiology of tobacco use reveals disparities across socioeconomic and educational lines, while emerging trends show declining traditional cigarette use among adolescents offset by increased adoption of e-cigarettes and smokeless tobacco products, the latter associated with severe respiratory injury syndromes like EVALI. The pathophysiology of smoking involves complex acute and chronic mechanisms: nicotine acts as an adrenergic agonist triggering catecholamine release and cardiovascular stress, while carbon monoxide competes with oxygen for hemoglobin binding with dramatically higher affinity, simultaneously impairing mucociliary clearance. Chronic exposure establishes physical tolerance through dopamine dysregulation, as smoking decreases monoamine oxidase B activity and perpetuates the reward cycle underlying addiction. Clinical assessment requires documentation of tobacco use as a vital sign, recognition of characteristic findings including stained dentition, chronic cough, and dyspnea, and utilization of validated instruments like the Fagerström Test to quantify dependence severity. Biochemical verification of smoking status employs exhaled carbon monoxide measurement or urinary and serum cotinine assays. Management employs the five A's framework—ask, advise, assess, assist, and arrange—integrated with stage-based behavioral counseling aligned to patient readiness. Pharmacological options include nicotine replacement therapies offering flexible delivery mechanisms, bupropion targeting dopamine and norepinephrine reuptake, and varenicline as a partial nicotinic receptor agonist, each requiring individualized selection based on contraindications and tolerability profiles. Successful cessation demands realistic expectations regarding relapse patterns, strategic follow-up scheduling, comprehensive education on withdrawal management and coping strategies, and linkage to community resources and support networks to sustain long-term abstinence.