| nAChRs | Nicotinic acetylcholine receptors |
| AEC | Airway epithelial cells |
| COPD | Chronic obstructive pulmonary disease |
| COVID-19 | Coronavirus disease 2019 |
| ACE-2 | Angiotensin-converting enzyme-2 |
| SARS-CoV-2 | Severe acute respiratory syndrome coronavirus |
| FFPE | Formalin-fixed paraffin-embedded |
| LAEC | Large airway epithelial cell |
| SAEC | Small airway epithelial cell |
| SNP | Single-nucleotide polymorphisms |
| RAS | Renin–angiotensin system |
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