AUTHOR=Li Yan , Shen Qianqian , Chen Chengyu , Yin Xueru , Wang Xinru , Yang Xiyue , Zhang Xueqian , Chen Lei , Xu Jian , Gong Guifang 

TITLE=A synergistic effect of secondhand smoke with vitamin D deficiency on cognitive impairment in older adults: a cross sectional study

JOURNAL=Frontiers in Nutrition

VOLUME=12

YEAR=2025

URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1533193

DOI=10.3389/fnut.2025.1533193

ISSN=2296-861X