Smokers’ utilization of quitting methods and vaping during pregnancy: an empirical cluster analysis of 2016–2018 Pregnancy Risk Assessment Monitoring System (PRAMS) data in seven US states

BACKGROUND: Patterns of utilization of numerous smoking cessation methods among pregnant women amidst the increasing popularity of vaping (use of e-cigarettes) remains unknown. METHODS: This study included 3,154 mothers who self-reported smoking around the time of conception and delivered live births in 2016–2018 in seven US states. Latent class analysis was used to identify subgroups of smoking women based on their utilization of 10 surveyed quitting methods and vaping during pregnancy. RESULTS: We identified four subgroups of smoking mothers with different utilization patterns of quitting methods during pregnancy: 22.0% reported “not trying to quit”; 61.4% tried to “quit on my own” without any behavioral or pharmacological assistance; 3.7% belonged to the “vaping” subgroup; and 12.9% utilized “wide-ranging methods” with higher use rate of multiple approaches, such as quit line and nicotine patch. Compared to mothers “not trying to quit,” the subgroup trying to “quit on my own” were more likely to be abstinent (adjusted OR 4.95, 95% CI 2.82–8.35) or to reduce the number of cigarettes smoked daily (adjusted OR 2.46, 95% CI 1.31–4.60) in late pregnancy, and these improvements lasted into early postpartum. We did not observe a measurable reduction in smoking among the “vaping” subgroup or women trying to quit with “wide-ranging methods”. CONCLUSIONS: We identified four subgroups of smoking mothers with different utilization patterns of eleven quitting methods during pregnancy. Pre-pregnancy smokers who tried to “quit on my own” were most likely to be abstinent or to reduce smoking amount. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12884-023-05608-3.