During the past 30D, on how many D did you smoke part or all of a cigarette:NRat:30D:^Patient:Qn:PhenX
during the past 30d, on how many d did you smoke part or all of a cigarette:nrat:30d:^patient:qn:phenx
During the past 30 days, on how many days did you smoke part or all of a cigarette [PhenX]
during the past 30 days, on how many days did you smoke part or all of a cigarette [phenx]