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How old were you when you started smoking?

How old were you when you stopped smoking?

This variable calculates the years a participant smoked cigarettes. This is calculated using the difference from the age the participant began smoking to either the participant's age at baseline examination or the age that the participant quit smoking (if applicable).

How much do you smoke now, OR if you quit smoking, how much did you smoke in the past (answer all that apply)? Bowls of pipe tobacco per day

How much do you smoke now, OR if you quit smoking, how much did you smoke in the past (answer all that apply)? Cigars per day

How much do you smoke now, OR if you quit smoking, how much did you smoke in the past (answer all that apply)? packs per week

Variable from a Multiple Sleep Latency Test (MSLT), Roehrs & Roth 1992 (PubMed ID: 1552009). Will you be able to go until 4pm today without caffeine or smoking 30 min prior to each nap? Search for all Multiple Sleep Latency Test variables within this dataset

If yes to [AGESMK15]: Since smoking began, were you a non-smoker for one year or more?

Current Smoking Status at the Sleep Heart Health Study Visit One (SHHS1) visit

How many years ago did you START smoking?

23a. If "No" how many years ago did you STOP smoking?

Current Smoking Status at the Sleep Heart Health Study Visit Two (SHHS2)

Indicates whether subject currently smokes cigarettes. Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: :nowsmoke:, :monsmoke: at Visit 5

Indicates whether subject currently smokes cigarettes. Harmonized by the NSRR team to align with TOPMed and BioDataCatalyst standards. Source: :tusmknow: at Visit 1