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Description
As this study is epidemiological, we do not know exact mechanism for such associations

Nicotine increases nervous system activity and can lead to: difficulty falling asleep, more frequent night-time awakenings, lighter, less restorative sleep, feelings of tiredness upon waking
CADR rating (Clean Air Delivery Rate) Why it matters: CADR quantifies how quickly a unit cleans smoke particles higher means faster clearing

To cite: Benowitz NL, Gan Q, Goniewicz ML, et al

Another reason is that cigarette holders help to keep smoke away from the face and eyes while also protecting fingers and teeth from staining
