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
Before today, have you ever “even once†used an electronic cigarette?
Imputation and derivation
Imputation
Before today, have you ever “even once†used an electronic cigarette?
Others
Security
Before today, have you ever “even once†used an electronic cigarette?
