Frequencies for first 10,000 rows of cig0_r variable in natl2014 dataset :

 Cigarettes |
     Before |
  Pregnancy |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,142       81.42       81.42
          1 |        456        4.56       85.98
          2 |        539        5.39       91.37
          3 |        431        4.31       95.68
          4 |         70        0.70       96.38
          5 |         40        0.40       96.78
          6 |        322        3.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016