Because of low frequencies of survivors not planning to quit (see results), the latter 2 categories were combined to create a dichotomous variable representing intentions of quitting versus not sure (or not).
Those who answered "yes" were further asked when they planned to quit.
Options were "less than a month from now," "in the next 3 months," "in the next 6 months," and "after 6 or more months.
" Because of low frequencies for the last 3 categories, they were merged to create a dichotomous variable representing smokers who planned to quit in less than a month versus in the next 3 months or later.