Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
Description
Source of information
B12. How many years ago did you first start smoking tobacco daily? [IF REFUSED, ENTER 99]
Imputation and derivation
Imputation
B12. How many years ago did you first start smoking tobacco daily? [IF REFUSED, ENTER 99]
Others
Security
B12. How many years ago did you first start smoking tobacco daily? [IF REFUSED, ENTER 99]
