Impact of Cigarette Smoke on Gut Microbiota Dynamics

Cigarette smoke exerts a profound influence on the community of microorganisms inhabiting the human gastrointestinal tract, often termed the gut microbiota. Chronic exposure to tobacco-derived chemicals alters microbial diversity, favours the proliferation of pathobionts and disrupts metabolic functions. These changes manifest as reduced bacterial richness, shifts in the balance between major phyla such as Firmicutes and Bacteroidetes, and perturbations in microbial metabolites including short-chain fatty acids. Such dysbiosis has been linked to impaired mucosal immunity, increased intestinal permeability and systemic inflammation. The lung–gut axis provides a bidirectional communication pathway whereby inhaled toxins can reshape gut ecology, and conversely, gut-derived signals modulate pulmonary responses. Globally, these microbial alterations may contribute to heightened risk of inflammatory bowel conditions, metabolic disorders and cardiovascular disease among smokers. Moreover, cessation of smoking induces partial restoration of microbial equilibrium, underscoring the dynamic nature of gut communities and their potential for resilience. Understanding these dynamics opens avenues for microbiota-targeted interventions—ranging from dietary modulation to probiotic or metabolite-based therapies—that may mitigate the health burden of smoking at a population level.

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Impact of Cigarette Smoke on Gut Microbiota Dynamics publication trend

The graph below shows the total number of articles in impact of cigarette smoke on gut microbiota dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Gut microbiota: The complex community of microorganisms residing in the gastrointestinal tract.

Dysbiosis: A state of microbial imbalance associated with disease or impaired function.

Mendelian randomisation: A genetic epidemiology method that uses inherited variants as proxies to infer causal relationships.

Metagenomic sequencing: High-throughput analysis of collective microbial genetic material from environmental samples.

Short-chain fatty acids (SCFAs): Metabolites produced by microbial fermentation of dietary fibres, important for gut health and immune regulation.

References

1. Cross-talks between gut microbiota and tobacco smoking: a two-sample Mendelian randomization study. BMC Medicine (2023).
2. Associations between Wastewater Microbiome and Population Smoking Rate Identified Using Wastewater-Based Epidemiology. Environment & Health (2023).
3. Association of nicotine dependence and gut microbiota: a bidirectional two-sample Mendelian randomization study. Frontiers in Immunology (2023).
4. Targeting Lung–Gut Axis for Regulating Pollution Particle–Mediated Inflammation and Metabolic Disorders. Cells (2023).
5. Smoking Cessation Induces Profound Changes in the Composition of the Intestinal Microbiota in Humans. PLOS ONE (2013).
6. Effect of Cigarette Smoke on Gut Microbiota: State of Knowledge. Frontiers in Physiology (2021).