Historical trends in daily smoking and quitting by relationship status in Norway, 1973–2022.

This study investigates trends in self-reported daily smoking and quitting in Norway from 1973 to 2022, focusing on differences by relationship status—defined as being in a formalised relationship (married or cohabitant) versus not. Analysis of repeated cross-sectional surveys of adults aged 25–74 shows a substantial overall decline in daily smoking for both men and women, but consistently higher smoking rates among individuals not in a formalised relationship, particularly since the 2000s. Women not in a relationship exhibited increased smoking rates from the mid-1980s, surpassing men in relationships, while quitting rates were higher among those in formalised relationships. The findings highlight persistent disparities in smoking behavior linked to relationship status and education, underscoring the importance of continued population-level monitoring to identify demographic groups that may require targeted tobacco control efforts.