Final answer:
Smoking and caffeine are associated with a lower risk of Lewy body dementia (LBD).
Step-by-step explanation:
The factor associated with a lower risk of Lewy body dementia (LBD) is Smoking and Caffeine. Several studies have shown that smoking cigarettes and consuming caffeine can reduce the risk of developing LBD. Smoking and caffeine intake have been found to lower the accumulation of alpha-synuclein, a protein that forms clumps in the brains of individuals with LBD, therefore reducing the risk of developing the condition.