Frequencies for first 10,000 rows of tobacco variable in natl1989 dataset :

Tobacco Use |
     During |
  Pregnancy |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,677       16.77       16.77
          2 |      8,202       82.02       98.79
          9 |        121        1.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016