SHARE Analysis of 50,000 Europeans Links Current Smoking to Greater Loneliness Increases Over Two Years

Researchers examined 50,000 participants averaging age 67 across 15 countries in the SHARE cohort. At baseline 22 percent smoked and nearly half reported multiple chronic conditions. Loneliness was quantified with the three-item UCLA scale at enrollment and again after two years. Current smokers recorded higher scores at both time points and experienced steeper increases than never or former smokers after adjustment for demographics and comorbidities. Regional variation remained minimal. The findings contradict the longstanding perception of smoking as a social facilitator. Progressive tobacco-related disease likely restricts mobility and social access while smoke-free policies further reduce opportunities for interaction. These mechanisms operate alongside established physical harms and may compound isolation in aging populations where loneliness already elevates mortality risk comparably to smoking itself. The study is cross-European yet observational, precluding causal inference. Residual confounding by unmeasured socioeconomic or mental-health factors remains possible. Interventional trials that randomize smokers to cessation support with or without loneliness-targeted components are required to test whether quitting reduces isolation trajectories and to guide integration with emerging nicotine-product regulations.