Heterogeneous Oral Health Outcomes by Combustible Cigarette Smoking, <scp>E</scp> ‐Cigarette Use and Dual Use: A Cross‐Sectional Population‐Based Analysis

BACKGROUND: Combustible cigarette smoking is a well-established risk factor for poor oral health, but the implications of e-cigarette use and dual use remain uncertain. Distinguishing the effects of vaping from the lingering consequences of prior smoking is a persistent challenge in the literature. OBJECTIVES: To assess how distinct nicotine use profiles relate to oral health-related quality of life, self-reported oral health indicators and self-rated dental health among adults in England, while differentiating e-cigarette users by smoking history. METHODS: We conducted a cross-sectional analysis of 6027 adults (aged ≥ 16 years) from the nationally representative 2021 Adult Oral Health Survey for England. Participants were classified into five current smoking/vaping categories (never users, former smokers, exclusive cigarette smokers, exclusive e-cigarette users, dual users) and, separately, by combined vaping-smoking history. Outcomes included any oral health difficulty and the number of impacts derived from the 14-item Oral Health Impact Profile (OHIP-14), as well as loose teeth, gum disease history, dry mouth and self-rated dental health. Binary outcomes (any oral health difficulty, loose teeth, gum disease history) were analysed using logistic regression, and ordinal outcomes (number of OHIP-14 impacts, dry mouth, self-rated dental health) using ordered logistic regression, with adjustment for sociodemographic, behavioural and oral hygiene covariates. RESULTS: Compared with never users, exclusive cigarette smokers had the highest adjusted odds of reporting any oral health difficulty (OR = 1.85, 95% CI: 1.51-2.27), loose teeth (OR = 3.18, 95% CI: 2.47-4.09), gum disease history (OR = 1.94, 95% CI: 1.52-2.49) and poorer self-rated dental health (OR = 2.88, 95% CI: 2.36-3.52). Dual users showed similarly elevated odds for loose teeth (OR = 3.11, 95% CI: 1.95-4.97), the highest odds for gum disease history (OR = 3.21, 95% CI: 2.06-4.99) and elevated odds for any oral health difficulty (OR = 1.55, 95% CI: 1.04-2.30) and poorer self-rated dental health (OR = 2.45, 95% CI: 1.68-3.58). Exclusive e-cigarette users also showed elevated odds across outcomes, though generally of smaller magnitude. Estimates for the very small subgroup of never-smoking current e-cigarette users did not show significant excess odds across outcomes, but were imprecise and should be regarded as exploratory. CONCLUSION: In this cross-sectional population-based analysis, combustible cigarette smoking and dual use were associated with poorer self-reported oral health outcomes. Findings related to e-cigarette use require cautious interpretation because of prior smoking history, the sparse never-smoker vaping subgroup and the absence of detailed exposure data (e.g., smoking intensity, pack-years, time since cessation, vaping duration, device type and nicotine concentration). Smoking cessation should remain central to preventive dentistry.