S - SmokingDrinking

ND7SDDN(Derived) Completed smoking and drinking questions
ND7SMOKE(Derived) Smoking habits
N7SMOKIGSmoking frequency
N7NFCIGSSmoking frequency per day
N7EXSMERWhether has ever been a regular smoker
N7AGEQUTAge when last was a regular smoker
N7DRINKSFrequency of drinking alcohol
N7UNITS1Number of units of drinks in an average week
N7UNITS2Number of units of drinks in an average day
ND7DGRP(Derived) CM alcohol units in a week by category