Frequencies for first 10,000 rows of usetobac variable in namcs2015 dataset :

Tobacco Use |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        170        1.70        1.70
         -8 |      1,488       14.88       16.58
          1 |      7,489       74.89       91.47
          2 |        853        8.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017