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In addition to these visible improvements, quitting smoking also lowers your likelihood of developing serious skin problems, including skin cancer, which is often linked to the harmful effects of tobacco smoke
In addition, there is evidence that smokers have significantly smaller olfactory bulbs and less grey matter volume in the olfactory gyrus in comparison with non-smoker 10

Abbreviations COPD: Chronic obstructive pulmonary disease ROS: Reactive oxygen species DAMPs: Damage-associated molecular patterns RAGE: Receptor for advanced glycation end products TLRs: Toll-like receptors MAPK: Mitogen-activated protein kinase NF-kB: Nuclear factor kappa-light-chain-enhancer of activated B cells MMPs: Matrix metalloproteinases LDL: Low-density lipoprotein NO: Nitric oxide WHO: World Health Organization SES: Socioeconomic status LGBTQ+: Lesbian, gay, bisexual, transgender, queer/questioning, and others NRT: Nicotine replacement therapy ENDS: Electronic nicotine delivery systems HTPs: Heated tobacco products PG: Propylene glycol VG: Vegetable glycerin PAHs: Polycyclic aromatic hydrocarbons FEV1: Forced expiratory volume in 1 s FVC: Forced vital capacity CT: Computed tomography ARDS: Acute respiratory distress syndrome References Addissouky TA (2019) Detecting liver fibrosis by recent reliable biomarkers in viral hepatitis patients