age when starting to smoke

Phase 1: If you smoke cigarettes now or have smoked cigarettes regularly: How old were you when you started to smoke cigarettes? Age in years.

Years

Integer

BL smoking category

Phase 1: baseline smoking category. 0 = never smoked, 1 = ex-occasional, 2 = occasional, 3 = ex-regular smoker, 4 = Regular cigarette smoker, 5 = Regular cigar/pipe, 6 = Regular cigar, 7 = Regular pipe, 9 = no code

Categorical

P1 nr of years since quitting

Phase 1: number of years since quitting

Years

Integer

BL smoking category

Phase 1: Baseline smoking category. 0 = Non-smoker; 1 = Ex-smoker; 2 = Current smoker; 3 = Other;

Categorical