Sex of Subject
1 = Male
2 = Female

Smoking Status
0 = 'UNKNOWN'
1 = 'NEVER SMOKED'
2 = 'CURRENT SMOKER'
3 = 'FORMER SMOKER'
4 = 'CURRENT AND QUIT'
9 = 'NO QUESTIONNAIRE DATA'

0 = 'NOT INDICATED'
1 = 'CIGARETTES OCC'
2 = '<1/2 PACKS/DAY'
3 = 'ABOUT A PACK/DAY'
4 = '2+ PACKS CIG/DAY'
5 = 'PIPE ETC OCCSIONALLY'
6 = 'PIPE ETC DAILY'
7 = 'CIG OCC & PIPE'
8 = '<2 PCKS CIG/PIPE DAILY'
9 = 'UNKNOWN'