Frequencies for first 10,000 rows of cig0_r variable in natlterr2014 dataset :

 Cigarettes |
     Before |
  Pregnancy |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,456       84.56       84.56
          1 |        133        1.33       85.89
          2 |        151        1.51       87.40
          3 |         81        0.81       88.21
          4 |          8        0.08       88.29
          6 |         94        0.94       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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